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Satellite-based alpine water dynamics response to climate change across the Tibetan Plateau 基于卫星的青藏高原高寒水动态对气候变化的响应
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.05.007
Yuling Liang , Hui Zhao , Meihong Wang , Xiaodan Wang
The spatiotemporal water dynamics across the Tibetan Plateau (TP) are important for sustainable utilization and management of water resources in Asia, particularly under the influence of climate change. However, comprehensive assessments of the long-term variations in lakes, marshlands, and terrestrial water storage (TWS) across the TP remain limited. This study utilized a long-term series of Landsat images of the TP to create annual lake maps with 30-m spatial resolution for the period 1990–2022, using a surface water frequency algorithm and Google Earth Engine (GEE). Based on the derived maps, the spatiotemporal trends of marshland area (MA) were analyzed. We also investigated changes in TWS from 2002 to 2022 using GRACE and GRACE-FO data products. Furthermore, we conducted a quantitative analysis of the drivers of changes in lake area (LA) and TWS. Results show that from 1990 to the 2020s, both LA and the number of lakes increased rapidly, with the most pronounced changes occurring in the Inner Plateau. In contrast, MA exhibited a declining trend during 1990–2020, also predominantly in the Inner Plateau. TWS exhibited an overall increasing trend, predominantly occurring in the Inner Plateau, where lakes are most densely distributed—mirroring the spatial pattern of lake expansion. The findings of this study could assist both the government and the general public in confronting the escalating challenges regarding water resources and water security in China.
青藏高原时空水动态对亚洲水资源的可持续利用和管理具有重要意义,特别是在气候变化的影响下。然而,对整个青藏高原湖泊、沼泽地和陆地储水量(TWS)长期变化的综合评估仍然有限。本研究利用青藏高原的一系列长期Landsat图像,利用地表水频率算法和谷歌地球引擎(GEE),创建了1990-2022年期间30米空间分辨率的年度湖泊地图。在此基础上,分析了湿地面积的时空变化趋势。我们还使用GRACE和GRACE- fo数据产品调查了2002年至2022年TWS的变化。此外,我们还对湖泊面积(LA)和TWS变化的驱动因素进行了定量分析。结果表明:1990 ~ 21世纪20年代,湖泊数量和LA均呈快速增长趋势,其中以内高原变化最为明显;1990—2020年,MA呈下降趋势,且主要集中在高原腹地。TWS总体呈增加趋势,主要发生在湖泊分布最密集的内高原地区,反映了湖泊扩张的空间格局。本研究的结果可以帮助政府和公众应对中国水资源和水安全方面日益严峻的挑战。
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引用次数: 0
Spatial distribution of soil organic carbon and nutrients in the southern Sundarbans of Bangladesh 孟加拉国孙德尔本斯南部土壤有机碳和养分的空间分布
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.03.005
Abu Bakar Siddique , Muhaiminul Islam , Nishat Tasnim , Abdullah Al Maruf , Abu Sayed Al Helal , Masum Howlader
The Sundarbans, the world’s largest mangrove forest plays a crucial role in carbon sequestration and coastal ecosystem stability. This study investigated the spatial distribution of surface soil nutrients, organic carbon (%OC), salinity, and pH, along with their interrelationships, at a regional scale in the southern part of the Sundarbans. In this study, a total of 21 soil samples were taken from 10 cm depth at 21 locations in the southern part of the Sundarbans areas. The surface soil samples were analyzed in the laboratory to determine essential soil properties, including organic carbon (%OC), nitrogen (%N), phosphorous (P), potassium (K), magnesium (Mg), calcium (Ca), sulfur (S), pH, electric conductivity (EC), and salinity. The results showed spatial variations of nutrient concentrations, with higher surface soil organic carbon (%OC) and nutrient levels observed in areas with lower salinity and pH. Pearson’s correlation matrix (PCM) analysis revealed a significant negative correlation between surface OC and both salinity and pH (p < 0.05). Moreover, the soils were predominantly silt-textured, with nutrient levels ranging from normal to brackish-saline, largely influenced by salinity intrusion. Cluster analysis (CA) and principal component analysis (PCA) revealed distinct patterns in surface soil physicochemical properties, suggesting that salinity, pH, and organic carbon are main factors influencing nutrient distribution in the study area. The study emphasizes the need to conserve the Sundarbans by reducing anthropogenic activities, regulating freshwater inflows to control salinity, and promoting mangrove regeneration to maintain soil health and ecological balance.
孙德尔本斯是世界上最大的红树林,在碳封存和沿海生态系统稳定方面发挥着至关重要的作用。研究了孙德尔本斯南区表层土壤养分、有机碳(%OC)、盐度和pH的空间分布特征及其相互关系。本研究在孙德尔本斯地区南部的21个地点采集了21个10 cm深度的土壤样本。在实验室对表层土壤样品进行分析,以确定土壤的基本性质,包括有机碳(%OC)、氮(%N)、磷(P)、钾(K)、镁(Mg)、钙(Ca)、硫(S)、pH、电导率(EC)和盐度。结果显示养分浓度存在空间差异,在盐度和pH较低的地区,表层土壤有机碳(%OC)和养分水平较高。Pearson 's相关矩阵(PCM)分析显示,表层土壤有机碳(%OC)与盐度和pH均呈显著负相关(p <;0.05)。此外,土壤以粉砂质为主,营养水平从正常到微咸不等,主要受盐度入侵的影响。聚类分析(CA)和主成分分析(PCA)揭示了表层土壤理化性质的明显变化规律,表明盐度、pH和有机碳是影响研究区土壤养分分布的主要因素。该研究强调需要通过减少人为活动、调节淡水流入以控制盐度、促进红树林再生以保持土壤健康和生态平衡来保护孙德尔本斯。
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引用次数: 0
Hydrological challenges and agricultural opportunities in Northern Ghana: addressing climate change impacts and future pathways 加纳北部的水文挑战和农业机遇:应对气候变化影响和未来途径
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.08.001
Prosper Kpiebaya , Abdul-Ganiyu Shaibu , Eliasu Salifu , Mabel Kumah , Mohammed Alhassan Issah , Rophina Muotieme Tingan
The management of water resources in agriculture is of paramount importance, especially in regions facing hydrological challenges exacerbated by climate change variability. This study explores the hydrological challenges, opportunities, and the way forward for agriculture in the Northern part of Ghana. The region faces issues such as water scarcity, erratic rainfall patterns, land degradation, floods, and droughts, which significantly impact agricultural productivity and livelihoods. This study identifies the region’s critical water management gaps and highlights both barriers and opportunities for sustainable agricultural growth. Our analysis emphasizes that climate-smart water technologies, such as drip irrigation, rainwater harvesting, and hydrological modeling, can significantly enhance water-use efficiency and resilience. Coupled with participatory water governance, infrastructure upgrades, and sustainable land management, these approaches can mitigate water scarcity, soil erosion, and climate risks. Through a comprehensive review of literature and analysis of hydrological data, this study provides insights into the complex interactions between climate change, water resources, and agriculture in Northern Ghana. By understanding these dynamics and implementing appropriate adaptation strategies, stakeholders can work towards building a more resilient agricultural sector capable of addressing the challenges posed by climate change variability.
农业水资源管理至关重要,特别是在面临因气候变化多变性而加剧的水文挑战的地区。本研究探讨了加纳北部农业面临的水文挑战、机遇和未来发展方向。该地区面临着水资源短缺、降雨模式不稳定、土地退化、洪水和干旱等问题,这些问题严重影响了农业生产力和生计。本研究确定了该地区在水管理方面的重大差距,并强调了可持续农业增长的障碍和机遇。我们的分析强调,气候智能型水资源技术,如滴灌、雨水收集和水文建模,可以显著提高水资源利用效率和复原力。这些方法与参与式水治理、基础设施升级和可持续土地管理相结合,可以缓解水资源短缺、土壤侵蚀和气候风险。通过对文献的全面回顾和对水文数据的分析,本研究深入了解了加纳北部气候变化、水资源和农业之间复杂的相互作用。通过了解这些动态并实施适当的适应战略,利益相关者可以努力建设一个更具抵御力的农业部门,能够应对气候变化多变性带来的挑战。
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引用次数: 0
Lake Babati ecosystem, Tanzania: biodiversity status, anthropogenic threats, and land use implications − a review 坦桑尼亚巴巴提湖生态系统:生物多样性现状、人为威胁和土地利用影响综述
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.06.002
Jackson Henry Katonge, Leopody Gayo
This is a systematic literature review exploring the effects of anthropogenic activities and land use changes on biodiversity and the ecological health of Lake Babati. A structured search using PRISMA (preferred reporting items for systematic reviews and meta-analyses) 2020 employed three major academic databases, namely Scopus, PubMed, and Web of Science. A key factor for choosing sources was their connection to Lake, along with being peer-reviewed, verified by institutions, providing real data on ecological or socio-economic impacts, and being written in English. Information was collected and analyzed by categorizing it into key drivers: changes in land use, pollution, and overfishing. Farming near the lake, cattle grazing and drinking, unsustainable brick-making, overgrazing, illegal fishing, inadequate waste management, and urban expansion have been reported. These practices have led to pollution, the spread of water hyacinth and sedges, nutrient loading, eutrophication, decreased dissolved oxygen, deforestation, soil erosion, flooding, and biodiversity loss-all of which endanger aquatic life. Between 1992 and 2022, land-use changes in Babati Town included increases in institutional land (797.2 ha), industrial land (64.7 ha), and agricultural land (691 ha), while forested areas (−705 ha), undeveloped land (−993 ha), and the lake surface (−173 ha) declined. Fish catch weight fell by 88 %, and daily catch rates declined by 90.8 %, with the most severe decline occurring between 1992 and 2002. Ecological changes have impacted the livelihoods of local communities that depended on fishing and agriculture. We recommend sustainable land use, better water quality monitoring, community conservation, local socio-economic resilience, and strong governance to support waste management and ecosystem restoration.
本文对人类活动和土地利用变化对巴巴提湖生物多样性和生态健康的影响进行了系统的文献综述。使用PRISMA(系统评价和荟萃分析的首选报告项目)2020进行结构化搜索,使用了三个主要的学术数据库,即Scopus, PubMed和Web of Science。选择来源的一个关键因素是它们与Lake的联系,以及同行评审、机构验证、提供生态或社会经济影响的真实数据,以及用英文撰写。收集和分析信息,将其分类为关键驱动因素:土地利用变化、污染和过度捕捞。据报道,湖泊附近的农业、放牧和饮用牲畜、不可持续的制砖、过度放牧、非法捕鱼、废物管理不足以及城市扩张。这些做法导致了污染、水葫芦和芦苇的蔓延、养分负荷、富营养化、溶解氧减少、森林砍伐、土壤侵蚀、洪水和生物多样性丧失——所有这些都危及水生生物。1992 - 2022年间,巴巴提镇的土地利用变化包括机构用地(797.2 ha)、工业用地(64.7 ha)和农业用地(691 ha)的增加,而森林面积(- 705 ha)、未开发用地(- 993 ha)和湖面面积(- 173 ha)的减少。渔获重量下降88%,日渔获率下降90.8%,其中最严重的下降发生在1992年至2002年之间。生态变化影响了依赖渔业和农业的当地社区的生计。我们建议可持续的土地利用、更好的水质监测、社区保护、地方社会经济复原力和强有力的治理,以支持废物管理和生态系统恢复。
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引用次数: 0
Weakly supervised bird-flock counting in wetlands based on multimodal optical image perception 基于多模态光学图像感知的湿地弱监督鸟群计数
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.05.006
Shuxiang Feng , Mengxue Lyu , Xuetao Han , Chang Liu , Jun Qiu
As crucial bio-indicators for wetland ecosystem health assessment, wetland birds play a pivotal role in ecological monitoring and conservation. This study address three challenges in avian population monitoring using optical remote sensing imagery, including high cost of manual annotation, difficulty in extracting small target features in complex background, and insufficient adaptability of multi-scale target recognition. We propose a weakly supervised bird-flock counting method based on the optical image multimodal perception model integrating optical image features and visual semantic features without location annotation. Based on optical image feature enhancement, visual semantic features related to the counting task are extracted through visual cues (counting text prompt), and a learnable feature adapter is introduced to fuse optical image features with visual semantic features. Thus, an optical image multimodal perception model with residual connection mechanism and multi-scale information interaction module is constructed. The residual connection mechanism effectively alleviates the interference caused by posture changes and complex background, and the multi-scale information interaction module solves the problem of target scale change through cross-scale semantic propagation. We construct an optical images bird-flock dataset named Wetland-Bird-Count for the Yellow River Delta coastal wetlands. The experimental results show that the MAE and MSE of the proposed method are 45.2 and 54.2, which is much more accurate than other weakly supervised and unsupervised methods and close to the fully supervised counting method, which verifies that the weakly supervised cluster counting using optical image visual cues can improve the accuracy of bird flock counting under lightweight annotation. This study provides a reliable quantitative analysis tool for optical image ecological monitoring.
湿地鸟类作为湿地生态系统健康评价的重要生物指标,在湿地生态监测和保护中发挥着举足轻重的作用。针对光学遥感鸟类种群监测中存在的人工标注成本高、复杂背景下小目标特征提取困难、多尺度目标识别适应性不足等问题,进行了研究。提出了一种基于光学图像多模态感知模型的弱监督鸟群计数方法,该模型集成了光学图像特征和视觉语义特征,无需位置标注。在光学图像特征增强的基础上,通过视觉线索(计数文本提示)提取与计数任务相关的视觉语义特征,并引入可学习特征适配器将光学图像特征与视觉语义特征融合。因此,构建了具有残差连接机制和多尺度信息交互模块的光学图像多模态感知模型。残差连接机制有效缓解姿态变化和复杂背景带来的干扰,多尺度信息交互模块通过跨尺度语义传播解决目标尺度变化问题。以黄河三角洲滨海湿地为研究对象,构建了一个光学影像鸟群数据集——湿地鸟数(wetlands - bird- count)。实验结果表明,该方法的MAE和MSE分别为45.2和54.2,比其他弱监督和无监督计数方法的准确率要高得多,接近于完全监督计数方法,验证了基于光学图像视觉线索的弱监督聚类计数可以提高轻量化注释下鸟群计数的准确率。本研究为光学影像生态监测提供了可靠的定量分析工具。
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引用次数: 0
Geospatial analysis of wetland dynamics and watershed monitoring in Pokhara Valley, Nepal 尼泊尔博卡拉河谷湿地动态的地理空间分析与流域监测
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.06.001
Krishna Prasad Sigdel , Narayan Prasad Ghimire , Binod Dawadi
Lakes are essential components of ecosystems and serve as important indicators of climate change and human impact. This study employed historical remote sensing images and geospatial analysis to examine the dynamics of three significant wetlands (Phewa, Begnas, and Rupa lakes) in the Pokhara Valley of Nepal, which are designated as Ramsar sites. Changes in land use land cover (LULC) and soil erosion within the watersheds of these lakes were also monitored using Landsat images and soil erosion dataset, respectively. Additionally, climatic trends in the Pokhara Valley were analyzed using data from ground-based monitoring stations. The results highlight a notable 11.39 % decline in the surface area of Phewa Lake since 1989, while the surface areas of Begnas and Rupa have remained relatively stable. Changes in LULC show an increase in forest cover (+47 to 64 %) and decrease in croplands (−36 to 59 %) across all watersheds. Urbanization is most pronounced in the Phewa watershed, leading to increased pollution and shoreline encroachment. The decline in cropland may improve water quality by decreasing agricultural runoff. However, soil erosion is most severe in cropland areas, resulting in Phewa lake receiving the highest sediment influx among the three lakes. The lake regions have been experiencing changes in temperature (0.3 °C per decade) and rainfall (insignificant slight increase). Changes in these lakes are primarily driven by watershed dynamics and human activities. These results underscore the necessity for integrated watershed management and further in-depth investigation into the effects of climate change on these ecosystems for regional sustainability.
湖泊是生态系统的重要组成部分,是气候变化和人类影响的重要指标。本研究利用历史遥感影像和地理空间分析,考察了尼泊尔博卡拉山谷三个重要湿地(Phewa、Begnas和Rupa湖)的动态变化,这三个湿地被指定为拉姆萨尔湿地。利用Landsat影像和土壤侵蚀数据,分别监测了湖泊流域土地利用、土地覆被和土壤侵蚀的变化。此外,利用地面监测站的数据分析了博卡拉山谷的气候趋势。结果表明,自1989年以来,费瓦湖的面积减少了11.39%,而贝格纳斯湖和鲁帕湖的面积保持相对稳定。LULC的变化表明,所有流域的森林覆盖增加(+ 47%至64%),农田覆盖减少(- 36%至59%)。城市化在Phewa流域最为明显,导致污染加剧和海岸线被侵占。耕地的减少可以通过减少农业径流来改善水质。然而,耕地地区水土流失最为严重,导致费瓦湖的输沙量在三个湖泊中最高。湖区一直在经历温度(每十年0.3°C)和降雨量(微不足道的轻微增加)的变化。这些湖泊的变化主要是由流域动态和人类活动驱动的。这些结果强调了综合流域管理和进一步深入研究气候变化对这些生态系统的影响对区域可持续性的必要性。
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引用次数: 0
Integrated watershed management for transforming dryland livelihoods: A climate-smart strategy for sustainable dryland agriculture in India 改变旱地生计的综合流域管理:印度可持续旱地农业的气候智能型战略
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.03.006
Ram A. Jat , Dinesh Jinger , Anita Kumawat , Saswat Kumar Kar , Indu Rawat , Suresh Kumar , Venkatesh Paramesh , Vijay Singh Meena , Rajesh Kaushal , Kuldeep Kumar , Hari Singh Meena , S.P. Wani , Rajbir Singh , M. Madhu
In India, 51 % of the net sown area relies on rainfed agriculture, with 40 % of landholdings unirrigated and 13 % partially irrigated. Rainfed farming produces 40 % of food grains and supports two-thirds of the livestock population but faces challenges like land degradation, low productivity, and biodiversity loss due to erratic monsoons and extreme weather. Additionally, India’s water scarcity is worsening, with per capita availability expected to reduce from 802 cubic meters in 2022 to 677 cubic meters by 2050. Therefore, to meet the diverse food requirements of the burgeoning population of the country, conservation of natural resources, and improving the living standard of the resource-poor small and marginal farmers is imperative. Integrated watershed management (IWM) has emerged as a climate-smart strategy to address these challenges by enhancing soil and water conservation, agricultural productivity, and livelihoods in dryland systems. This study assesses the impact of IWM on dryland agriculture in India by analyzing various interventions such as in-situ and ex-situ water conservation, soil health management, and the use of modern technologies like remote sensing (RS) and geographic information systems (GIS). The results revealed that the adoption of IWM practices has led to significant improvements in soil moisture retention (20–25 %), soil organic carbon (22–32 %) agricultural productivity (30–45 %), and water use efficiency (15–25 %). Additionally, soil conservation techniques have reduced soil loss and runoff by 25–50 % and 50–60 %, respectively. Furthermore, the cultivation of lemon grass (Cymbopogon flexuosus), anjan grass (Cenchrus ciliaris), and bamboo (Bambusa spp.) could be the nature-based solutions for mitigating the impact of climate change due to their soil binding capacity and carbon sequestration potential. Moreover, this review indicates the potential of fast-growing trees (Melia dubia) under the agroforestry system in enhancing carbon sequestration by >100 % over sole cultivation. These results demonstrate that IWM is a sustainable solution to mitigate the adverse effects of climate change on dryland farming systems and improve rural livelihoods. Further, the study suggests that IWM practices helps to achieve sustainable development goals (SDGs) such as zero hunger, no poverty, and climate action etc., particularly in the face of climate change in water-scarce regions.
在印度,51%的净播种面积依靠雨养农业,40%的土地没有灌溉,13%的土地只有部分灌溉。雨养农业生产了40%的粮食,养活了三分之二的牲畜,但面临着土地退化、生产力低下和因不稳定的季风和极端天气导致的生物多样性丧失等挑战。此外,印度的水资源短缺正在恶化,人均可用水量预计将从2022年的802立方米减少到2050年的677立方米。因此,为了满足该国不断增长的人口对食物的多样化需求,保护自然资源,提高资源贫乏的小农和边缘农民的生活水平势在必行。综合流域管理(IWM)已成为一项气候智能型战略,通过加强旱地系统的水土保持、农业生产力和生计来应对这些挑战。本研究通过分析各种干预措施,如原位和非原位水土保持、土壤健康管理以及遥感(RS)和地理信息系统(GIS)等现代技术的使用,评估了IWM对印度旱地农业的影响。结果表明,采用IWM措施可显著提高土壤保墒(20 - 25%)、土壤有机碳(22 - 32%)、农业生产力(30 - 45%)和水分利用效率(15 - 25%)。此外,土壤保持技术使土壤流失和径流分别减少了25 - 50%和50 - 60%。此外,种植柠檬草(Cymbopogon flexuosus)、冬青草(Cenchrus ciliaris)和竹子(Bambusa spp.)可能是缓解气候变化影响的自然解决方案,因为它们具有土壤结合能力和碳固存潜力。此外,本综述还指出,在农林复合系统下,速生乔木(Melia dubia)的固碳潜力比单独种植提高100%。这些结果表明,IWM是缓解气候变化对旱地农业系统不利影响和改善农村生计的可持续解决方案。此外,研究表明,IWM实践有助于实现可持续发展目标(sdg),如零饥饿、无贫困和气候行动等,特别是在缺水地区面临气候变化的情况下。
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引用次数: 0
Hydrochemical characteristics, water quality and diatom assemblage in Dordi River, Nepal 尼泊尔多迪河水化学特征、水质和硅藻组合
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2024.12.002
Punam Phuyal , Shraddha Ranabhat , Sanjal Khatri , Nabin Lamichhane , Ramesh Raj Pant , Lal Bahadur Thapa , Ram Kailash Prasad Yadav
Understanding hydrochemistry and diatom assemblage is important for assessing the health of aquatic ecosystems. This study has analyzed the water quality and diatom communities in the Dordi River, which is one of the major tributaries of the Marsyangdi River in Nepal. The primary research question being addressed in the study was what is the state of water quality parameters of Dordi River and how do they relate to the distribution and composition of diatoms. The water quality parameters of the river like temperature, pH, electric conductivity (EC), total dissolved solids (TDS), dissolved oxygen (DO), turbidity, and total alkalinity (TA) were measured in-situ, whereas concentrations of major ions (Ca2+, Mg2+, K+, Na+, NH4+, HCO3, Cl, SO42–, NO3, and PO43–), biological oxygen demand (BOD) and chemical oxygen demand (COD) were analyzed in the laboratory by collecting water samples from different parts of the river. Piper plot, Gibbs plot, Mixing plots, redundancy analysis, and principal component analysis were applied for evaluating the spatial variation of anions and cations in water. The results showed alkaline water following the pattern: Ca2+>Mg2+>Na+>K+>NH4+ for cation and HCO3>Cl>SO42–>PO43–>NO3 for anion with calcium-bicarbonate dominant lithology in the river. Overall, the results highlight that the drinking and irrigation water qualities of the river were found to be excellent. Additionally, among 75 diatom species observed in the samples, the Bacillariophyceae was the dominant class covering 92% of the species. The results indicated that the diatom species richness declined as elevation increased. The distribution of diatoms was also influenced by the land use types near the water sampling points, tributaries and the main river. Overall, the physico-chemical quality of water showed significant influence on diatom species composition. The findings of this study could be useful for understanding hydrochemistry and association of water quality and diatoms in river basins of the Himalaya.
了解水化学和硅藻组合对评估水生生态系统的健康具有重要意义。本研究分析了尼泊尔马尔尚底河主要支流之一的多迪河的水质和硅藻群落。本研究的主要研究问题是Dordi河的水质参数是什么状态,以及它们与硅藻的分布和组成有何关系。现场测量了温度、pH、电导率(EC)、总溶解固形物(TDS)、溶解氧(DO)、浊度和总碱度(TA)等水质参数,并在实验室采集了不同河段的水样,分析了主要离子(Ca2+、Mg2+、K+、Na+、NH4+、HCO3 -、Cl -、SO42 -、NO3 -和PO43 -)浓度、生物需氧量(BOD)和化学需氧量(COD)。采用Piper图、Gibbs图、混合图、冗余分析和主成分分析评价了水体中阴离子和阳离子的空间变化。结果表明,该河流碱性水具有Ca2+>;Mg2+>Na+>K+>;阳离子为NH4+,阴离子为HCO3 - >;Cl - >SO42 - >PO43 - >NO3 -,碳酸氢钙为主岩性。总体而言,结果突出表明,该河流的饮用和灌溉水质优良。此外,在75种硅藻中,硅藻门为优势纲,占总数的92%。结果表明,随着海拔的升高,硅藻物种丰富度呈下降趋势。水样点、支流和干流附近的土地利用类型对硅藻的分布也有影响。总体而言,水体理化质量对硅藻种类组成有显著影响。本研究结果对了解喜玛拉雅山流域水化学及水质与硅藻的关系具有重要意义。
{"title":"Hydrochemical characteristics, water quality and diatom assemblage in Dordi River, Nepal","authors":"Punam Phuyal ,&nbsp;Shraddha Ranabhat ,&nbsp;Sanjal Khatri ,&nbsp;Nabin Lamichhane ,&nbsp;Ramesh Raj Pant ,&nbsp;Lal Bahadur Thapa ,&nbsp;Ram Kailash Prasad Yadav","doi":"10.1016/j.wsee.2024.12.002","DOIUrl":"10.1016/j.wsee.2024.12.002","url":null,"abstract":"<div><div>Understanding hydrochemistry and diatom assemblage is important for assessing the health of aquatic ecosystems. This study has analyzed the water quality and diatom communities in the Dordi River, which is one of the major tributaries of the Marsyangdi River in Nepal. The primary research question being addressed in the study was what is the state of water quality parameters of Dordi River and how do they relate to the distribution and composition of diatoms. The water quality parameters of the river like temperature, pH, electric conductivity (EC), total dissolved solids (TDS), dissolved oxygen (DO), turbidity, and total alkalinity (TA) were measured <em>in-situ</em>, whereas concentrations of major ions (Ca<sup>2+</sup>, Mg<sup>2+</sup>, K<sup>+</sup>, Na<sup>+</sup>, NH<sub>4</sub><sup>+</sup>, HCO<sub>3</sub><sup>–</sup>, Cl<sup>–</sup>, SO<sub>4</sub><sup>2–</sup>, NO<sub>3</sub><sup>–</sup>, and PO<sub>4</sub><sup>3–</sup>), biological oxygen demand (BOD) and chemical oxygen demand (COD) were analyzed in the laboratory by collecting water samples from different parts of the river. Piper plot, Gibbs plot, Mixing plots, redundancy analysis, and principal component analysis were applied for evaluating the spatial variation of anions and cations in water. The results showed alkaline water following the pattern: Ca<sup>2+</sup>&gt;Mg<sup>2+</sup>&gt;Na<sup>+</sup>&gt;K<sup>+</sup>&gt;NH<sub>4</sub><sup>+</sup> for cation and HCO<sub>3</sub><sup>–</sup>&gt;Cl<sup>–</sup>&gt;SO<sub>4</sub><sup>2–</sup>&gt;PO<sub>4</sub><sup>3–</sup>&gt;NO<sub>3</sub><sup>–</sup> for anion with calcium-bicarbonate dominant lithology in the river. Overall, the results highlight that the drinking and irrigation water qualities of the river were found to be excellent. Additionally, among 75 diatom species observed in the samples, the Bacillariophyceae was the dominant class covering 92% of the species. The results indicated that the diatom species richness declined as elevation increased. The distribution of diatoms was also influenced by the land use types near the water sampling points, tributaries and the main river. Overall, the physico-chemical quality of water showed significant influence on diatom species composition. The findings of this study could be useful for understanding hydrochemistry and association of water quality and diatoms in river basins of the Himalaya.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"7 ","pages":"Pages 23-35"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158894","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}
引用次数: 0
Closed depressions and karst landforms in Rif Alpine Cordillera (Northern Morocco): The case of dolomitic Jbel Dersa Massif 摩洛哥北部Rif Alpine Cordillera的封闭洼地与喀斯特地貌:以白云岩Jbel Dersa地块为例
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.08.002
Samira Kaddouri , Younes EL Kharim , Kamal Agharroud , Ali Bounab , Youssef El Miloudi , Reda Sahrane , Ahmed Taoufik Ouahabi
The morphology, distribution, and structural control of karst closed depressions in a dolomitic karst landscape are the focus of this study. The study area is the Jbel Dersa Massif (JDM), part of the “Dorsale Calcaire” (DC) unit within the Rif Mountain range in northern Morocco. A combined analysis of geomorphological mapping and structural studies reveal that the Pliocene dismantling phase smoothed the crests of the original imbricate thrust fronts, characteristic feature of the DC unit’s structure. The flattening of the massif’s summit facilitated the dissolution of the rock surface. In addition to the massif’s ruiniform landscape, the observed karstic features include fracture lapies, closed karstic depressions at the summit, and travertine deposits along the structural contacts with the bordering non-karstic units. The 26 identified closed depressions are dissolution dolines. Morphometric analysis indicates that these dolines are primarily located in the endorheic and axial zones of the massif and are preferentially aligned along tectonic faults. Structural, geomorphological, and ERT profile analyses of two sinkholes confirm the structural control over their development and demonstrate that seepage occurs through the fractured material along fault planes. This study highlights the scientific, environmental, and water-supply significance of the JDM. Its karst depressions, serving as primary infiltration zones, play a crucial role in local hydrogeology, providing water sources for several settlements that rely on the massif’s springs.
本文重点研究了白云岩岩溶封闭性洼地的形态、分布及构造控制。研究区域是Jbel Dersa地块(JDM),是摩洛哥北部Rif山脉“Dorsale Calcaire”(DC)单元的一部分。地貌填图与构造研究相结合表明,上新世的拆拆阶段使原始叠瓦状冲断前缘的波峰变得平滑,这是直流单元构造的特征。山体顶部的变平促进了岩石表面的溶解。除了该地块的废墟状景观外,观察到的岩溶特征还包括断裂带、峰顶闭合岩溶洼地以及沿与周边非岩溶单元构造接触的钙华矿床。确定的26个封闭凹陷为溶蚀凹陷。形态计量学分析表明,这些白云线主要分布在地块的内海带和轴向带,并优先沿构造断裂排列。两个陷坑的构造、地貌和ERT剖面分析证实了构造对其发育的控制作用,并表明沿断层面的裂隙物质发生渗流。这项研究突出了JDM的科学、环境和供水意义。它的喀斯特洼地作为主要的入渗区,在当地的水文地质中起着至关重要的作用,为依赖该地块泉水的几个定居点提供了水源。
{"title":"Closed depressions and karst landforms in Rif Alpine Cordillera (Northern Morocco): The case of dolomitic Jbel Dersa Massif","authors":"Samira Kaddouri ,&nbsp;Younes EL Kharim ,&nbsp;Kamal Agharroud ,&nbsp;Ali Bounab ,&nbsp;Youssef El Miloudi ,&nbsp;Reda Sahrane ,&nbsp;Ahmed Taoufik Ouahabi","doi":"10.1016/j.wsee.2025.08.002","DOIUrl":"10.1016/j.wsee.2025.08.002","url":null,"abstract":"<div><div>The morphology, distribution, and structural control of karst closed depressions in a dolomitic karst landscape are the focus of this study. The study area is the Jbel Dersa Massif (JDM), part of the “Dorsale Calcaire” (DC) unit within the Rif Mountain range in northern Morocco. A combined analysis of geomorphological mapping and structural studies reveal that the Pliocene dismantling phase smoothed the crests of the original imbricate thrust fronts, characteristic feature of the DC unit’s structure. The flattening of the massif’s summit facilitated the dissolution of the rock surface. In addition to the massif’s ruiniform landscape, the observed karstic features include fracture lapies, closed karstic depressions at the summit, and travertine deposits along the structural contacts with the bordering non-karstic units. The 26 identified closed depressions are dissolution dolines. Morphometric analysis indicates that these dolines are primarily located in the endorheic and axial zones of the massif and are preferentially aligned along tectonic faults. Structural, geomorphological, and ERT profile analyses of two sinkholes confirm the structural control over their development and demonstrate that seepage occurs through the fractured material along fault planes. This study highlights the scientific, environmental, and water-supply significance of the JDM. Its karst depressions, serving as primary infiltration zones, play a crucial role in local hydrogeology, providing water sources for several settlements that rely on the massif’s springs.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"7 ","pages":"Pages 398-412"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895242","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}
引用次数: 0
Artificial intelligence applications in hydrological studies and ecological restoration of watersheds: A systematic review 人工智能在水文研究和流域生态修复中的应用综述
Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.05.004
Fernando Morante-Carballo , Mirka Arcentales-Rosado , Jhon Caicedo-Potosí , Paúl Carrión-Mero
Water resources management is fundamental to the sustainability of river basins. Water quality is affected by pollution caused by human activities. In this context, the restoration of degraded watersheds helps soil recovery, sustainable water management, reforestation, biodiversity conservation and mitigation of human impacts. Artificial intelligence (AI) innovates data management and analysis processes by optimising decision-making and data analysis in hydrological studies and ecological restoration. This research aims to analyse scientific information related to the integration of AI in studies on hydrogeology and ecological restoration of watersheds by analysing scientific databases for knowledge of the intellectual structure, lines and trends of research. The methodology includes three phases: i) search criteria and data processing (Scopus-Web of Science); ii) analysis of the intellectual and conceptual structure; and iii) application of the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) method. The results indicate that there is a total of 171 records, with a 4.49% growth in scientific production in the last four years, focusing on artificial neural networks (10.53%), artificial intelligence (3.51%), genetic algorithms (1.17%) and machine learning (1.17%). This increase is due to the climatic variation generated in recent years, driven by anthropogenic pressures, especially in the agricultural sector due to the high demand for fertiliser and pesticide pollution. This problem has prompted the search for more far-reaching environmental management technologies, making it a potential niche for study. China (72.51%) and the United States (25.73%) are the most outstanding contributors to production in this area. On the other hand, there is less research in this area in developing countries such as South Africa (2.92%), Colombia (1.17%), and Argentina (0.58%), among others. This analysis identifies opportunities and challenges in applying AI for water resource optimisation and water quality prediction, providing an innovative conceptual framework for sustainable watershed management.
水资源管理是河流流域可持续发展的基础。水质受到人类活动污染的影响。在这方面,恢复退化的流域有助于土壤恢复、可持续水资源管理、重新造林、生物多样性保护和减轻人类影响。人工智能(AI)通过优化水文研究和生态恢复中的决策和数据分析,创新数据管理和分析过程。本研究旨在通过分析科学数据库的知识结构、研究方向和趋势,分析与人工智能在水文地质与流域生态恢复研究中的整合相关的科学信息。该方法包括三个阶段:i)搜索标准和数据处理(Scopus-Web of Science);Ii)智力和概念结构分析;iii)应用系统评价和荟萃分析(PRISMA)方法的首选报告项目。结果表明,共有171项记录,近四年科学产出增长4.49%,主要集中在人工神经网络(10.53%)、人工智能(3.51%)、遗传算法(1.17%)和机器学习(1.17%)。这种增加是由于近年来人为压力造成的气候变化,特别是在农业部门,由于对化肥和农药污染的高需求。这一问题促使人们寻求影响更深远的环境管理技术,使其成为一个潜在的研究领域。中国(72.51%)和美国(25.73%)是该地区产量贡献最突出的国家。另一方面,发展中国家在这方面的研究较少,如南非(2.92%)、哥伦比亚(1.17%)和阿根廷(0.58%)等。该分析确定了将人工智能应用于水资源优化和水质预测的机遇和挑战,为可持续流域管理提供了创新的概念框架。
{"title":"Artificial intelligence applications in hydrological studies and ecological restoration of watersheds: A systematic review","authors":"Fernando Morante-Carballo ,&nbsp;Mirka Arcentales-Rosado ,&nbsp;Jhon Caicedo-Potosí ,&nbsp;Paúl Carrión-Mero","doi":"10.1016/j.wsee.2025.05.004","DOIUrl":"10.1016/j.wsee.2025.05.004","url":null,"abstract":"<div><div>Water resources management is fundamental to the sustainability of river basins. Water quality is affected by pollution caused by human activities. In this context, the restoration of degraded watersheds helps soil recovery, sustainable water management, reforestation, biodiversity conservation and mitigation of human impacts. Artificial intelligence (AI) innovates data management and analysis processes by optimising decision-making and data analysis in hydrological studies and ecological restoration. This research aims to analyse scientific information related to the integration of AI in studies on hydrogeology and ecological restoration of watersheds by analysing scientific databases for knowledge of the intellectual structure, lines and trends of research. The methodology includes three phases: i) search criteria and data processing (Scopus-Web of Science); ii) analysis of the intellectual and conceptual structure; and iii) application of the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) method. The results indicate that there is a total of 171 records, with a 4.49% growth in scientific production in the last four years, focusing on artificial neural networks (10.53%), artificial intelligence (3.51%), genetic algorithms (1.17%) and machine learning (1.17%). This increase is due to the climatic variation generated in recent years, driven by anthropogenic pressures, especially in the agricultural sector due to the high demand for fertiliser and pesticide pollution. This problem has prompted the search for more far-reaching environmental management technologies, making it a potential niche for study. China (72.51%) and the United States (25.73%) are the most outstanding contributors to production in this area. On the other hand, there is less research in this area in developing countries such as South Africa (2.92%), Colombia (1.17%), and Argentina (0.58%), among others. This analysis identifies opportunities and challenges in applying AI for water resource optimisation and water quality prediction, providing an innovative conceptual framework for sustainable watershed management.</div></div>","PeriodicalId":101280,"journal":{"name":"Watershed Ecology and the Environment","volume":"7 ","pages":"Pages 230-248"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105700","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}
引用次数: 0
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Watershed Ecology and the Environment
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