Pub Date : 2025-11-22DOI: 10.1016/j.wsee.2025.10.005
Yang Zheng , Pei Liu , Gang Wang , Chengfen Xu , Dan Kong , Xiujuan Mu
With the increasing demand for the development and utilization of Marine space, the usage of sea area in three-dimensional style has become a powerful means to alleviate the contradiction of sea use and enhance the value of sea area resources. According to the structure characteristics of the sea space, the sea space is divided into four layers: above sea level space (D1), seawater space (D2), Quaternary sedimentary layer space (D3) and bedrock layer space (D4). Based on the summary of the types of available resources for each layer, the paper discusses the confirmable right to use the sea and the compatibility for different layers. From the Angle of intensive, efficient and green sea use, four typical three-dimensional development modes of sea area are put forward. In view of the contradiction between the existing management system and the usage of sea area in three-dimensional style, the optimization suggestions for usage of sea area in three-dimensional style are put forward from the aspects of compatibility assessment system, coordination and compatibility of layered right in sea area, and three-dimensional property right system.
{"title":"Exploration for the model of three-dimensional layered confirmation of sea area rights based on the concept of intensive sea use","authors":"Yang Zheng , Pei Liu , Gang Wang , Chengfen Xu , Dan Kong , Xiujuan Mu","doi":"10.1016/j.wsee.2025.10.005","DOIUrl":"10.1016/j.wsee.2025.10.005","url":null,"abstract":"<div><div>With the increasing demand for the development and utilization of Marine space, the usage of sea area in three-dimensional style has become a powerful means to alleviate the contradiction of sea use and enhance the value of sea area resources. According to the structure characteristics of the sea space, the sea space is divided into four layers: above sea level space (D1), seawater space (D2), Quaternary sedimentary layer space (D3) and bedrock layer space (D4). Based on the summary of the types of available resources for each layer, the paper discusses the confirmable right to use the sea and the compatibility for different layers. From the Angle of intensive, efficient and green sea use, four typical three-dimensional development modes of sea area are put forward. In view of the contradiction between the existing management system and the usage of sea area in three-dimensional style, the optimization suggestions for usage of sea area in three-dimensional style are put forward from the aspects of compatibility assessment system, coordination and compatibility of layered right in sea area, and three-dimensional property right system.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 55-62"},"PeriodicalIF":0.0,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-18DOI: 10.1016/j.wsee.2025.11.001
Irina Salgado-Bernal , Gabriela Cejas-Añón , Alen Nils Baeza-Fonte , Armando Martínez-Sardiña , María E. Carballo-Valdés , Periyasamy Sivalingam , John Poté
Ciprofloxacin (CIP) is a widely used broad-spectrum antibiotic. Its persistence and hydrophobic nature pose environmental risks to aquatic ecosystems. There is a lack of studies on the isolation and characterization of antibiotic-degrading microorganisms, especially in tropical ecosystems; although bacterial resistance to antibiotics in aquatic systems have been extensively studied. This study introduces a comprehensive methodological approach to evaluate the biodegradation potential of autochthonous bacteria, specifically Exiguobacterium sp. (T-316), isolated from the sediments of the Almendares River in Havana. The methodology integrates three key stages: (1) assessment of antibiotic resistance profiles, including the determination of minimum inhibitory concentration (MIC) for CIP, (2) evaluation of biodegradation capacity, and (3) measurement of residual antibiotic activity in post-treated water. Exiguobacterium sp. strain displayed a ciprofloxacin MIC of 7 µg mL−1, indicating resistance. Biodegradation assays demonstrated this strain degraded 74.36 % of CIP in model water systems through co-metabolism (biodegradation of CIP using a co-substrate for metabolic support), with significant differences in the presence of a co-substrate. The final CIP concentration in effluents was significantly lower than the initial concentration. Notably, transformation products were detected after 72 h, regardless of glucose supplementation. The residual antibiotic activity in water treated under co-metabolic conditions showed a complete (100 %) reduction. This framework provides a robust and reproducible strategy for identifying and characterizing environmental bacterial strains with antibiotic degradation potential, especially relevant to underrepresented tropical ecosystems, despite their high microbial diversity. This study supports the development of sustainable processes for treating antibiotic-contaminated water, and is the first comprehensive report on CIP biodegradation in Cuba.
{"title":"Biodegradation of ciprofloxacin by Exiguobacterium sp. from tropical river sediments: an integrated approach","authors":"Irina Salgado-Bernal , Gabriela Cejas-Añón , Alen Nils Baeza-Fonte , Armando Martínez-Sardiña , María E. Carballo-Valdés , Periyasamy Sivalingam , John Poté","doi":"10.1016/j.wsee.2025.11.001","DOIUrl":"10.1016/j.wsee.2025.11.001","url":null,"abstract":"<div><div>Ciprofloxacin (CIP) is a widely used broad-spectrum antibiotic. Its persistence and hydrophobic nature pose environmental risks to aquatic ecosystems. There is a lack of studies on the isolation and characterization of antibiotic-degrading microorganisms, especially in tropical ecosystems; although bacterial resistance to antibiotics in aquatic systems have been extensively studied. This study introduces a comprehensive methodological approach to evaluate the biodegradation potential of autochthonous bacteria, specifically <em>Exiguobacterium</em> sp. (T-316), isolated from the sediments of the Almendares River in Havana. The methodology integrates three key stages: (1) assessment of antibiotic resistance profiles, including the determination of minimum inhibitory concentration (MIC) for CIP, (2) evaluation of biodegradation capacity, and (3) measurement of residual antibiotic activity in post-treated water. <em>Exiguobacterium</em> sp. strain displayed a ciprofloxacin MIC of 7 µg mL<sup>−1</sup>, indicating resistance. Biodegradation assays demonstrated this strain degraded 74.36 % of CIP in model water systems through co-metabolism (biodegradation of CIP using a co-substrate for metabolic support), with significant differences in the presence of a co-substrate. The final CIP concentration in effluents was significantly lower than the initial concentration. Notably, transformation products were detected after 72 h, regardless of glucose supplementation. The residual antibiotic activity in water treated under co-metabolic conditions showed a complete (100 %) reduction. This framework provides a robust and reproducible strategy for identifying and characterizing environmental bacterial strains with antibiotic degradation potential, especially relevant to underrepresented tropical ecosystems, despite their high microbial diversity. This study supports the development of sustainable processes for treating antibiotic-contaminated water, and is the first comprehensive report on CIP biodegradation in Cuba.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 46-54"},"PeriodicalIF":0.0,"publicationDate":"2025-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-03DOI: 10.1016/j.wsee.2025.10.004
Khojiakbar Khasanov, Masharif Bakiev
This study examines the long-term sedimentation dynamics and their impact on the storage capacity of the Hisorak Reservoir over 42 years (1980–2022). Sedimentation rates, capacity loss, and spatial volume changes were analyzed by comparing the original design data with bathymetric surveys conducted in 2003 and 2022. Four interpolation techniques—Inverse Distance Weighting (IDW), Radial Basis Function (RBF), Ordinary Kriging (OK), and Empirical Bayesian Kriging (EBK)—were applied to process bathymetric data and evaluated using RMSE, MAE, R2, and SDpred. Among them, OK provided the highest accuracy (RMSE = 1.13, MAE = 0.008, R2 = 0.996). The resulting spatial model enabled precise capacity calculations, showing a reduction of 39.4 Mm3 (23.2 %) in reservoir storage due to sedimentation. Between 2003 and 2022, sediment accumulated at an average rate of 0.88 Mm3 yr−1, more than three times the design estimate of 0.272 Mm3 yr−1. A Surface Difference Map revealed concentrated deposition in upstream zones and erosion along reservoir boundaries. These findings demonstrate that sedimentation is progressing faster than anticipated, causing accelerated storage loss. The study highlights the usefulness of geostatistical methods and surface difference analysis for assessing reservoir sedimentation and supports the development of more effective management and sediment-control strategies in arid-region reservoirs such as Hisorak.
本研究考察了长崎水库42年（1980-2022年）的长期沉积动态及其对库容的影响。通过将原始设计数据与2003年和2022年进行的水深测量数据进行比较，分析了沉积速率、容量损失和空间体积变化。四种插值技术——逆距离加权（IDW）、径向基函数（RBF）、普通克里格（OK）和经验贝叶斯克里格（EBK）——被应用于处理水深数据，并使用RMSE、MAE、R2和SDpred进行评估。其中，OK的准确度最高（RMSE = 1.13, MAE = 0.008, R2 = 0.996）。由此产生的空间模型可以进行精确的容量计算，显示由于沉积作用，水库储存量减少了39.4 Mm3（23.2%）。在2003年至2022年期间，沉积物的平均积累速率为0.88 Mm3 yr - 1，是设计估算值0.272 Mm3 yr - 1的三倍多。地表差值图显示，上游地区沉积集中，沿水库边界有侵蚀。这些发现表明，沉积的进展速度比预期的要快，导致了储存的加速损失。这项研究强调了地质统计方法和地表差异分析对评价水库沉积的有用性，并支持在诸如历史ak这样的干旱地区水库制定更有效的管理和控制沉积战略。
{"title":"Assessing sediment-induced storage capacity loss in the Hisorak Reservoir, Uzbekistan","authors":"Khojiakbar Khasanov, Masharif Bakiev","doi":"10.1016/j.wsee.2025.10.004","DOIUrl":"10.1016/j.wsee.2025.10.004","url":null,"abstract":"<div><div>This study examines the long-term sedimentation dynamics and their impact on the storage capacity of the Hisorak Reservoir over 42 years (1980–2022). Sedimentation rates, capacity loss, and spatial volume changes were analyzed by comparing the original design data with bathymetric surveys conducted in 2003 and 2022. Four interpolation techniques—Inverse Distance Weighting (IDW), Radial Basis Function (RBF), Ordinary Kriging (OK), and Empirical Bayesian Kriging (EBK)—were applied to process bathymetric data and evaluated using RMSE, MAE, R<sup>2</sup>, and SDpred. Among them, OK provided the highest accuracy (RMSE = 1.13, MAE = 0.008, R<sup>2</sup> = 0.996). The resulting spatial model enabled precise capacity calculations, showing a reduction of 39.4 Mm<sup>3</sup> (23.2 %) in reservoir storage due to sedimentation. Between 2003 and 2022, sediment accumulated at an average rate of 0.88 Mm<sup>3</sup> yr<sup>−1</sup>, more than three times the design estimate of 0.272 Mm<sup>3</sup> yr<sup>−1</sup>. A Surface Difference Map revealed concentrated deposition in upstream zones and erosion along reservoir boundaries. These findings demonstrate that sedimentation is progressing faster than anticipated, causing accelerated storage loss. The study highlights the usefulness of geostatistical methods and surface difference analysis for assessing reservoir sedimentation and supports the development of more effective management and sediment-control strategies in arid-region reservoirs such as Hisorak.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 23-35"},"PeriodicalIF":0.0,"publicationDate":"2025-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145519502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-02DOI: 10.1016/j.wsee.2025.10.006
Novy Ariyanto , Anisah Anisah , Virny Zasyana Eka Putri , Yoyon Wahyono , Hashfi Hawali Abdul Matin , Isnaeni Kumalasari , Mutia Citrawati Lestari , Muhammad Raihan Farras Hakim , Anissa Dewi Suryaningtyas , Sundari Sundari , Nugroho Adi Sasongko , Martin Anda , Anggara Lomak Prihatin , Lambas Parlaungan Panggabean
Karimunjawa National Park (KNP) is an emerging tourism destination in Indonesia, where increasing tourism has led to excessive groundwater use and land subsidence. These issues pose environmental and health risks from emissions and seawater intrusion. This study examines the potential effects of these factors on the environment and human health within KNP. The research utilizes OpenLCA software 2.0.1 and the Ecoinvent 3.8 database, applying the CML-IA Baseline method for environmental impact assessment and the EPS 2015d method for human health impacts. The results show that the largest environmental impact is eutrophication, with the highest values recorded at spot 11 (6.94E-06 kg PO4– eq). At spot 5, where copper (Cu) contamination reached the highest levels, the Authors observed the most significant ecotoxicity impacts, affecting freshwater (3.67E-06 kg 1,4-DB eq) ecosystems. Human health impacts, including intellectual disability (2.62E-10 Person-Years), and renal dysfunction (1.028E-13 case), were most significant at spot 5, linked to lead (Pb) contamination. The study suggests that reducing human activity in areas contributing to eutrophication and ecotoxicity, such as controlling nitrate and copper pollution, could mitigate environmental damage. Moreover, addressing human toxicity and health risks from lead requires improving waste management, ecosystem rehabilitation, pesticide reduction, and strengthening environmental monitoring. Public awareness of these risks is essential for effective mitigation.
Karimunjawa国家公园（KNP）是印度尼西亚一个新兴的旅游目的地，在那里，日益增长的旅游业导致了地下水的过度使用和地面沉降。这些问题造成了排放和海水入侵带来的环境和健康风险。本研究探讨了这些因素在国家公园内对环境和人类健康的潜在影响。本研究采用OpenLCA 2.0.1软件和Ecoinvent 3.8数据库，采用CML-IA Baseline方法进行环境影响评价，采用EPS 2015d方法进行人体健康影响评价。结果表明：水体富营养化对环境影响最大，11点水体富营养化程度最高（6.94E-06 kg PO4 - eq）；在5号地点，铜（Cu）污染达到最高水平，作者观察到最显著的生态毒性影响，影响淡水生态系统（3.67E-06 kg 1,4- db eq）。人类健康影响，包括智力残疾（2.62E-10人年）和肾功能障碍（1.028E-13例），在5号点最为显著，与铅（Pb）污染有关。该研究表明，在导致富营养化和生态毒性的地区减少人类活动，如控制硝酸盐和铜污染，可以减轻环境破坏。此外，解决铅对人体的毒性和健康风险需要改进废物管理、恢复生态系统、减少农药和加强环境监测。公众对这些风险的认识对于有效减轻风险至关重要。
{"title":"Quantitative evaluation of environmental and human health impacts in an Indonesian conservation region: A life cycle assessment (LCA) approach","authors":"Novy Ariyanto , Anisah Anisah , Virny Zasyana Eka Putri , Yoyon Wahyono , Hashfi Hawali Abdul Matin , Isnaeni Kumalasari , Mutia Citrawati Lestari , Muhammad Raihan Farras Hakim , Anissa Dewi Suryaningtyas , Sundari Sundari , Nugroho Adi Sasongko , Martin Anda , Anggara Lomak Prihatin , Lambas Parlaungan Panggabean","doi":"10.1016/j.wsee.2025.10.006","DOIUrl":"10.1016/j.wsee.2025.10.006","url":null,"abstract":"<div><div>Karimunjawa National Park (KNP) is an emerging tourism destination in Indonesia, where increasing tourism has led to excessive groundwater use and land subsidence. These issues pose environmental and health risks from emissions and seawater intrusion. This study examines the potential effects of these factors on the environment and human health within KNP. The research utilizes OpenLCA software 2.0.1 and the Ecoinvent 3.8 database, applying the CML-IA Baseline method for environmental impact assessment and the EPS 2015d method for human health impacts. The results show that the largest environmental impact is eutrophication, with the highest values recorded at spot 11 (6.94E-06 kg PO<sub>4</sub>– eq). At spot 5, where copper (Cu) contamination reached the highest levels, the Authors observed the most significant ecotoxicity impacts, affecting freshwater (3.67E-06 kg 1,4-DB eq) ecosystems. Human health impacts, including intellectual disability (2.62E-10 Person-Years), and renal dysfunction (1.028E-13 case), were most significant at spot 5, linked to lead (Pb) contamination. The study suggests that reducing human activity in areas contributing to eutrophication and ecotoxicity, such as controlling nitrate and copper pollution, could mitigate environmental damage. Moreover, addressing human toxicity and health risks from lead requires improving waste management, ecosystem rehabilitation, pesticide reduction, and strengthening environmental monitoring. Public awareness of these risks is essential for effective mitigation.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 133-141"},"PeriodicalIF":0.0,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-27DOI: 10.1016/j.wsee.2025.10.003
Paul Walakira , Cecilia Gichuki , John Muriuki , Ezekiel Ndunda , Peter B. Olanya , Pantaleon M.B. Kasoma
Wetlands are ecologically and socioeconomically vital ecosystems, yet they remain highly vulnerable to human-induced disturbances. This study assessed plant species composition, diversity, and ecological dominance within Kanyabaha Wetland in Uganda to generate baseline ecological data that can inform sustainable management. Standard vegetation survey techniques and ecological indices, including Shannon-Wiener, Simpson’s Diversity, and Importance Value Index (IVI), were employed across sites with varying disturbance levels. A total of 31 plant species belonging to 19 families were recorded, with notable variation in species richness and composition across sites. Less disturbed areas (e.g., Rutenje and Burime) exhibited higher native species richness and stronger ecological integrity, while highly disturbed sites like Kandago were dominated by introduced species, particularly Eucalyptus spp. Interestingly, Kandago recorded the highest diversity indices, suggesting that while disturbance may increase species evenness, it compromises ecological balance. The dominance of few species in disturbed areas indicated a shift in vegetation structure, potentially disrupting ecosystem functionality. To address these issues, the study recommends targeted conservation measures, such as the removal or control of invasive species, promotion of native species regeneration, and community-led restoration initiatives. These findings are crucial for wetland managers, conservation agencies, and policy-makers, offering a scientific basis for prioritizing conservation areas and designing context-specific management interventions. The study contributes to the broader understanding of plant community responses to disturbance, supporting ongoing ecological monitoring and evidence-based restoration planning.
{"title":"Plant species diversity and composition in Kanyabaha wetland in Rukiga District, Uganda","authors":"Paul Walakira , Cecilia Gichuki , John Muriuki , Ezekiel Ndunda , Peter B. Olanya , Pantaleon M.B. Kasoma","doi":"10.1016/j.wsee.2025.10.003","DOIUrl":"10.1016/j.wsee.2025.10.003","url":null,"abstract":"<div><div>Wetlands are ecologically and socioeconomically vital ecosystems, yet they remain highly vulnerable to human-induced disturbances. This study assessed plant species composition, diversity, and ecological dominance within Kanyabaha Wetland in Uganda to generate baseline ecological data that can inform sustainable management. Standard vegetation survey techniques and ecological indices, including Shannon-Wiener, Simpson’s Diversity, and Importance Value Index (IVI), were employed across sites with varying disturbance levels. A total of 31 plant species belonging to 19 families were recorded, with notable variation in species richness and composition across sites. Less disturbed areas (e.g., Rutenje and Burime) exhibited higher native species richness and stronger ecological integrity, while highly disturbed sites like Kandago were dominated by introduced species, particularly Eucalyptus spp. Interestingly, Kandago recorded the highest diversity indices, suggesting that while disturbance may increase species evenness, it compromises ecological balance. The dominance of few species in disturbed areas indicated a shift in vegetation structure, potentially disrupting ecosystem functionality. To address these issues, the study recommends targeted conservation measures, such as the removal or control of invasive species, promotion of native species regeneration, and community-led restoration initiatives. These findings are crucial for wetland managers, conservation agencies, and policy-makers, offering a scientific basis for prioritizing conservation areas and designing context-specific management interventions. The study contributes to the broader understanding of plant community responses to disturbance, supporting ongoing ecological monitoring and evidence-based restoration planning.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 36-45"},"PeriodicalIF":0.0,"publicationDate":"2025-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145519501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-17DOI: 10.1016/j.wsee.2025.10.001
Janet Maluleke, Ndidzulafhi Innocent Sinthumule
Wetlands provide diverse ecosystem services but are increasingly degraded due to anthropogenic activities. Poor management has made wetlands to undergone significant change because of various anthropogenic activities. This study aimed at investigating the impacts of land use land cover changes (LULCC) over 32 years (1990–2022) in the condition and status of a peri-urban wetland in Tembisa, Gauteng province in South Africa. To achieve the aim of the study, various Landsat TM 4–5, SPOT 5 and 6, and Sentinel 2A were processed in ArcGIS Pro to assess, map and monitor the extent of LULCC in Kaalspruit wetland. A multi-source satellite image analysis was performed using a Maximum Likelihood classification algorithm in supervised classification to provide a quantitative assessment and a detailed overview of the rate of change. The result showed that built-up areas and bare land increased by 255.37 ha and 22.32 ha, respectively, while cultivated land, vegetation, and water bodies decreased by 111.33 ha, 144.42 ha, and 20.78 ha, respectively. Such changes show significant human interventions such as expansion of infrastructural development, pollution and cultivation because of increased population pressure. Interventions should be made for the rehabilitation and sustainable management of wetlands in the peri-urban areas of Tembisa.
{"title":"Assessing land-use and land cover change in peri-urban wetland in Tembisa, South Africa","authors":"Janet Maluleke, Ndidzulafhi Innocent Sinthumule","doi":"10.1016/j.wsee.2025.10.001","DOIUrl":"10.1016/j.wsee.2025.10.001","url":null,"abstract":"<div><div>Wetlands provide diverse ecosystem services but are increasingly degraded due to anthropogenic activities. Poor management has made wetlands to undergone significant change because of various anthropogenic activities. This study aimed at investigating the impacts of land use land cover changes (LULCC) over 32 years (1990–2022) in the condition and status of a peri-urban wetland in Tembisa, Gauteng province in South Africa. To achieve the aim of the study, various Landsat TM 4–5, SPOT 5 and 6, and Sentinel 2A were processed in ArcGIS Pro to assess, map and monitor the extent of LULCC in Kaalspruit wetland. A multi-source satellite image analysis was performed using a Maximum Likelihood classification algorithm in supervised classification to provide a quantitative assessment and a detailed overview of the rate of change. The result showed that built-up areas and bare land increased by 255.37 ha and 22.32 ha, respectively, while cultivated land, vegetation, and water bodies decreased by 111.33 ha, 144.42 ha, and 20.78 ha, respectively. Such changes show significant human interventions such as expansion of infrastructural development, pollution and cultivation because of increased population pressure. Interventions should be made for the rehabilitation and sustainable management of wetlands in the peri-urban areas of Tembisa.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 75-87"},"PeriodicalIF":0.0,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145684501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rivers play a crucial role in maintaining ecological balance and providing essential resources; however, many are facing significant degradation, particularly in India, where urbanization and population growth exacerbate water scarcity. This study focuses on the Kalyani River, located in Barabanki district, Uttar Pradesh (India), which spans approximately 69.65 km and is vital for local communities. We employed an integrated approach combining geospatial technology, the HEC-RAS (Hydrologic Engineering Centers-River Analysis System) model, and field verification to assess river conditions and identify restoration needs. Our analysis revealed critical challenges affecting the Kalyani River, including siltation and blockages that hinder flow and contribute to flooding. The results indicate a recommended excavation length of approximately 22.37 km in the Nindora block, along with a total cleaning length of around 47.28 km for both Nindora and Fatehpur blocks. These findings underscore the necessity for immediate eco-restoration efforts to rejuvenate the river ecosystem and mitigate the impacts of human-induced changes. Furthermore, we mapped critical zones requiring intervention, emphasizing the need for community engagement in conservation initiatives. This study highlights the importance of not only addressing the physical restoration of the river but also fostering long-term ecological health through sustainable management practices. By comparing our findings with established river restoration projects, we contextualize the significance of our approach to enhance the resilience of the Kalyani River. Ultimately, this research offers valuable insights and actionable recommendations that can aid local authorities and stakeholders in implementing effective river management strategies, contributing to improved water security and ecological sustainability in the region.
{"title":"Rejuvenation of Kalyani River, Uttar Pradesh (India): A Study using Geospatial Modeling","authors":"Akash Pal , Neeraj Kumar , Shakti Suryavanshi , Krishan Tyagi , Jagadeesh Menon , Deepak Lal , Arnab Kundu , Neeraj Kumar Sharma , Easterlily Shylla , Mukesh Kumar","doi":"10.1016/j.wsee.2025.09.001","DOIUrl":"10.1016/j.wsee.2025.09.001","url":null,"abstract":"<div><div>Rivers play a crucial role in maintaining ecological balance and providing essential resources; however, many are facing significant degradation, particularly in India, where urbanization and population growth exacerbate water scarcity. This study focuses on the Kalyani River, located in Barabanki district, Uttar Pradesh (India), which spans approximately 69.65 km and is vital for local communities. We employed an integrated approach combining geospatial technology, the HEC-RAS (Hydrologic Engineering Centers-River Analysis System) model, and field verification to assess river conditions and identify restoration needs. Our analysis revealed critical challenges affecting the Kalyani River, including siltation and blockages that hinder flow and contribute to flooding. The results indicate a recommended excavation length of approximately 22.37 km in the Nindora block, along with a total cleaning length of around 47.28 km for both Nindora and Fatehpur blocks. These findings underscore the necessity for immediate eco-restoration efforts to rejuvenate the river ecosystem and mitigate the impacts of human-induced changes. Furthermore, we mapped critical zones requiring intervention, emphasizing the need for community engagement in conservation initiatives. This study highlights the importance of not only addressing the physical restoration of the river but also fostering long-term ecological health through sustainable management practices. By comparing our findings with established river restoration projects, we contextualize the significance of our approach to enhance the resilience of the Kalyani River. Ultimately, this research offers valuable insights and actionable recommendations that can aid local authorities and stakeholders in implementing effective river management strategies, contributing to improved water security and ecological sustainability in the region.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 13-22"},"PeriodicalIF":0.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-02DOI: 10.1016/j.wsee.2025.07.002
Alexander Nii Adjei Sowah
Coastal lagoons are highly productive ecosystems protected under laws of conservations. They provide extensive ecosystem services including fisheries, aquaculture, storm protection and tourism. In spite of the ecological, social, economic and cultural values of coastal lagoons, they suffer multiple pressures that threaten their ecological integrity and function. Population growth and its attendant increased demand for resources, expansion of the built environment to the fringes of such ecosystems and the production of waste are placing coastal lagoons’ ecosystems at the risk of collapse. Relying on Landsat satellite images of Land Cover of the Muni lagoon catchment of the Effutu Municipality of Ghana from 1993 to 2023 alongside field observations, the paper examines vegetation loss and land cover changes and how the observed changes influence/affects the lagoon’s ability to function and provide its ecological and socio-economic services. It was observed that apart from grassland which has steadily increased over the last three decades, marshes and mangroves have consistently reduced in size, from 21% of the total land cover in 1993 to 11% in 2003 and 10% in 2013 to 7% in 2023. A projected analysis of the different land cover for the next decade [2023–2033] indicated further shrinking of the mangrove and size of the lagoon itself. While the lagoon remains viable regarding some of the services it provides, losing mangroves, marshes and swamps have implications for the lagoon’s water holding capacity and ecosystem services it provides. This is especially against the backdrop of dangers posed to coastal communities by sea encroachment arising from climate-induced sea level rise.
{"title":"Vegetation loss of the muni coastal lagoon: Implications for ecosystem services and climate impacts","authors":"Alexander Nii Adjei Sowah","doi":"10.1016/j.wsee.2025.07.002","DOIUrl":"10.1016/j.wsee.2025.07.002","url":null,"abstract":"<div><div>Coastal lagoons are highly productive ecosystems protected under laws of conservations. They provide extensive ecosystem services including fisheries, aquaculture, storm protection and tourism. In spite of the ecological, social, economic and cultural values of coastal lagoons, they suffer multiple pressures that threaten their ecological integrity and function. Population growth and its attendant increased demand for resources, expansion of the built environment to the fringes of such ecosystems and the production of waste are placing coastal lagoons’ ecosystems at the risk of collapse. Relying on Landsat satellite images of Land Cover of the Muni lagoon catchment of the Effutu Municipality of Ghana from 1993 to 2023 alongside field observations, the paper examines vegetation loss and land cover changes and how the observed changes influence/affects the lagoon’s ability to function and provide its ecological and socio-economic services. It was observed that apart from grassland which has steadily increased over the last three decades, marshes and mangroves have consistently reduced in size, from 21% of the total land cover in 1993 to 11% in 2003 and 10% in 2013 to 7% in 2023. A projected analysis of the different land cover for the next decade [2023–2033] indicated further shrinking of the mangrove and size of the lagoon itself. While the lagoon remains viable regarding some of the services it provides, losing mangroves, marshes and swamps have implications for the lagoon’s water holding capacity and ecosystem services it provides. This is especially against the backdrop of dangers posed to coastal communities by sea encroachment arising from climate-induced sea level rise.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 100-109"},"PeriodicalIF":0.0,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145684502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-18DOI: 10.1016/j.wsee.2025.05.002
Ahmed Said , Mariama Assoumani , Mamie Ahmed Matoir , Thabiti Soudjay Kamal , Hamidou Hamada Soule , Qiwu Zhang , Mouayadi Said Ali Madi , Abacar Chakira , Zaïnati Ibrahim
Sulfur, the fifteenth most abundant element in the Earth’s crust, was activated through solvent-free ball milling to investigate its dissolution behavior and environmental implications. This study evaluated the influence of grinding conditions on sulfur’s phase transformation and solubility in different solvents. X-ray diffraction (XRD) analysis revealed a significant phase transition to the monoclinic β-sulfur phase (S-β) at a grinding speed of 500 rpm. Remarkably, sulfur solubility reached 807 ppm in water, compared to only 18.6 ppm in an acidic medium, underscoring the importance of solvent chemistry. Additionally, the activated sulfur exhibited self-photocatalytic activity, generating highly reactive oxidizing species crucial for the degradation of Methyl Orange (MO) dye, highlighting its potential for wastewater treatment. Advanced characterization techniques such as scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR) provided insights into the dissolution mechanisms. This study demonstrates the transformative potential of mechanically activated sulfur in environmental remediation and lays the foundation for future research on sustainable water treatment solutions.
{"title":"Impact of solvent-free ball milling on sulfur dissolution in groundwater simulants","authors":"Ahmed Said , Mariama Assoumani , Mamie Ahmed Matoir , Thabiti Soudjay Kamal , Hamidou Hamada Soule , Qiwu Zhang , Mouayadi Said Ali Madi , Abacar Chakira , Zaïnati Ibrahim","doi":"10.1016/j.wsee.2025.05.002","DOIUrl":"10.1016/j.wsee.2025.05.002","url":null,"abstract":"<div><div>Sulfur, the fifteenth most abundant element in the Earth’s crust, was activated through solvent-free ball milling to investigate its dissolution behavior and environmental implications. This study evaluated the influence of grinding conditions on sulfur’s phase transformation and solubility in different solvents. X-ray diffraction (XRD) analysis revealed a significant phase transition to the monoclinic β-sulfur phase (S-β) at a grinding speed of 500 rpm. Remarkably, sulfur solubility reached 807 ppm in water, compared to only 18.6 ppm in an acidic medium, underscoring the importance of solvent chemistry. Additionally, the activated sulfur exhibited self-photocatalytic activity, generating highly reactive oxidizing species crucial for the degradation of Methyl Orange (MO) dye, highlighting its potential for wastewater treatment. Advanced characterization techniques such as scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR) provided insights into the dissolution mechanisms. This study demonstrates the transformative potential of mechanically activated sulfur in environmental remediation and lays the foundation for future research on sustainable water treatment solutions.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"8 ","pages":"Pages 1-12"},"PeriodicalIF":0.0,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145099051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a study of droughts in the South Pre-Balkash region that considers climate change and its impact on the intensity and frequency of drought periods. The main objective of this study is to assess changes in climatic parameters and their impact on the development of droughts using standardized precipitation indices (SPI) and precipitation evapotranspiration (SPEI) for the period 1950–2023. Long-term rainfall and temperature data and remote sensing data from the Google Earth Engine platform were used for the analysis. The Mann-Kendall test was applied to assess trends in climatic conditions and drought characteristics.
The results showed that although both the SPI and SPEI can be used to assess droughts, the SPEI is more effective at capturing changes in air temperature increases. The intensity and frequency of drought periods increased after the 1990 s, especially as measured by the SPEI. Additionally, the results of the present study indicate an increase in the intensity and frequency of dry periods, which is associated with climate change. In the study area, climate change is characterised mainly by an increase in air temperature (0.17–0.39 °C/10 years). The SPEI index is more sensitive to changes in the water balance, as it takes into account the influences of both precipitation and evaporation, in contrast to the SPI index, which considers only the influence of precipitation. Consequently, when drought conditions are analyzed using the SPEI index, a more accurate representation of the depth and severity of drought is obtained. These findings have important implications for the development of adaptation measures in agriculture and water management in the context of increasing drought risk in the Southern Pre-Balkash region.
{"title":"Assessment of the impacts of climate change on drought intensity and frequency using SPI and SPEI in the Southern Pre-Balkash region, Kazakhstan","authors":"Alimkulov Sayat , Makhmudova Lyazzat , Talipova Elmira , Baspakova Gaukhar , Monkayeva Gulsara","doi":"10.1016/j.wsee.2024.12.001","DOIUrl":"10.1016/j.wsee.2024.12.001","url":null,"abstract":"<div><div>This paper presents a study of droughts in the South Pre-Balkash region that considers climate change and its impact on the intensity and frequency of drought periods. The main objective of this study is to assess changes in climatic parameters and their impact on the development of droughts using standardized precipitation indices (SPI) and precipitation evapotranspiration (SPEI) for the period 1950–2023. Long-term rainfall and temperature data and remote sensing data from the Google Earth Engine platform were used for the analysis. The Mann-Kendall test was applied to assess trends in climatic conditions and drought characteristics.</div><div>The results showed that although both the SPI and SPEI can be used to assess droughts, the SPEI is more effective at capturing changes in air temperature increases. The intensity and frequency of drought periods increased after the 1990 s, especially as measured by the SPEI. Additionally, the results of the present study indicate an increase in the intensity and frequency of dry periods, which is associated with climate change. In the study area, climate change is characterised mainly by an increase in air temperature (0.17–0.39 °C/10 years). The SPEI index is more sensitive to changes in the water balance, as it takes into account the influences of both precipitation and evaporation, in contrast to the SPI index, which considers only the influence of precipitation. Consequently, when drought conditions are analyzed using the SPEI index, a more accurate representation of the depth and severity of drought is obtained. These findings have important implications for the development of adaptation measures in agriculture and water management in the context of increasing drought risk in the Southern Pre-Balkash region.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"7 ","pages":"Pages 11-22"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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