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Effects of climate variability and/or land use dynamics on the hydrological balance of the Cavally river catchment at Toulepleu, West Africa 气候多变性和/或土地利用动态对西非图莱普勒卡瓦利河流域水文平衡的影响
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-22 DOI: 10.2166/wcc.2024.512
Yao Blé Anouma Fhorest, G. Soro, I. Larbi, A. Limantol, B. Goula
The study focuses on assessing the individual and combined impacts of climate variability and land use change on hydrological responses. The results indicate that the basin, urban area, cropland, degraded forest, and open forest shows an increasing trend, while gallery forest show a decreasing trend over the period 1992–2015. Climatic variability is marked by two climatic periods (a wet one from 1980 to 1996 and a dry one from 1997 to 2016) with a 35% decrease in rainfall. Regardless of the state of the landcover used, the simulated mean annual runoff decreases by 67.92% between the wet and dry climate periods. Changes in land use between 1992 and 2015 reduce mean annual runoff by 4.71%. Analysis of the joint effect of climatic and LU variation shows a 68.96% reduction in runoff. In this catchment, the joint impact has a clearly greater effect on runoff than the climatic impact, which is greater than that of human activities. There is a need for policymakers to prioritise sustainable land use practices and integrated water resource management strategies in the area to mitigate the combined effects of climate variability and anthropogenic activities, ensuring the long-term resilience of the ecosystem and water availability for local communities.
研究重点是评估气候多变性和土地利用变化对水文响应的单独和综合影响。结果表明,在 1992-2015 年期间,流域、城市地区、耕地、退化森林和疏林地呈上升趋势,而廊道森林呈下降趋势。气候变异的特点是有两个气候期(1980 年至 1996 年为湿润期,1997 年至 2016 年为干燥期),降雨量减少了 35%。无论所使用的土地覆盖状况如何,模拟的年平均径流量在湿润气候期和干旱气候期之间减少了 67.92%。1992 至 2015 年间土地利用的变化使年均径流量减少了 4.71%。对气候和土地利用变化共同影响的分析表明,径流量减少了 68.96%。在该流域,联合影响对径流的影响明显大于气候影响,而气候影响又大于人类活动影响。决策者需要优先考虑该地区的可持续土地利用实践和水资源综合管理战略,以减轻气候多变性和人为活动的综合影响,确保生态系统的长期恢复能力和当地社区的供水。
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引用次数: 0
Assessment of climate change impacts on rainfall and streamflow in the Alto Paranapanema Basin, Brazil 评估气候变化对巴西上帕拉纳帕内马盆地降雨和溪流的影响
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-17 DOI: 10.2166/wcc.2024.549
André Teixeira da Silva Hucke, Mateus Nardini Menegaz, Jorge Manuel Guieiro Pereira Isidoro, Rafael de Oliveira Tiezzi
Climate change has the potential to fundamentally transform landscapes on a global scale. Leveraging advanced predictive modeling to enhance water resource management within the Alto Paranapanema Basin (Brazil), holds the potential to proactively anticipate challenges and alleviate the impacts and conflicts arising from this phenomenon. This is particularly important in a region boasting over 1,600 center-pivot irrigation systems. This study employs the Soil Moisture Accounting Procedure, a physical model, to simulate long-term climate datasets and flows. Future climate scenarios, rooted in the Representative Concentration Pathways, are developed through the downscaling of Global Climate Models. The findings reveal a temporal shift in rainfall patterns, characterized by a reduction during the wet season of up to −40% compared to the average historical rainfall, and an increase throughout the dry season up to 40% compared to the same historical, estimated by the Eta–BESM model. These changes present challenges regarding to water availability, hydroelectric generation, and agricultural sustainability. By fostering collaboration among different governmental entities responsible for the managements of basins and harnessing the potential of predictive models, this research advocates for the adoption of proactive strategies in management of water resources. These strategies are imperative to effectively counteract the far-reaching effects of climate change.
气候变化有可能从根本上改变全球范围内的地貌。利用先进的预测建模来加强上帕拉纳帕内马盆地(巴西)的水资源管理,有可能主动预测挑战,减轻气候变化带来的影响和冲突。这对于拥有 1,600 多个中心枢纽灌溉系统的地区尤为重要。本研究采用土壤水分核算程序这一物理模型模拟长期气候数据集和流量。通过对全球气候模型进行降尺度处理,得出了以代表性浓度路径为基础的未来气候情景。研究结果表明,降雨模式发生了时间上的变化,与历史平均降雨量相比,雨季降雨量减少达-40%,而与 Eta-BESM 模型估计的历史平均降雨量相比,整个旱季降雨量增加达 40%。这些变化给水资源供应、水力发电和农业可持续发展带来了挑战。通过促进负责管理流域的不同政府实体之间的合作以及利用预测模型的潜力,本研究提倡在水资源管理中采取积极主动的策略。这些战略对于有效应对气候变化的深远影响至关重要。
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引用次数: 0
A stakeholder-driven holistic approach to mitigate drought in Ramsar wetlands: evaluation of nature-based solutions using interval analytic hierarchy process 利益相关者驱动的缓解拉姆萨尔湿地干旱的整体方法:利用区间层次分析法评估基于自然的解决方案
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-16 DOI: 10.2166/wcc.2024.705
Senka Ždero, B. Srđević, Z. Srđević
Wetland ecosystems are vital in maintaining the ecological balance of the wider area. The increase of frequent and intense droughts due to accelerated climate changes poses a threat to wetlands as fragile ecosystems which further require a holistic approach and cooperation between stakeholders to define long-term sustainable solutions. This paper focuses on identifying nature-based solutions to mitigate drought in Ramsar-designated sites through understanding the preferences of stakeholders for effective implementation. An interval version of the analytic hierarchy process is proposed as a systematic framework for selecting solutions considering multiple objectives (climate change mitigation, biodiversity preservation, and human welfare) and six alternatives applicable to Ramsar wetlands. The Serbian case study demonstrates the evaluation of alternatives using interval values in pairwise comparison matrices and priority weights were computed by linear programming. Top-ranked measures identified by three experts involve increasing water availability, supporting agroforestry practices, and utilizing natural reservoirs. Mulch and wastewater reuse are excluded due to additional implementation investments. The added value of the proposed approach is that the results can be used by managers and decision-makers in many ways; for example, weights of the alternatives could indicate resource allocation, while rankings serve as valuable indicators for optimizing the number of applied solutions.
湿地生态系统对于维持更广泛地区的生态平衡至关重要。由于气候变化加速,干旱日益频繁和剧烈,对作为脆弱生态系统的湿地构成了威胁,这就进一步要求利益相关者采用整体方法和开展合作,以确定长期可持续的解决方案。本文的重点是通过了解利益相关者对有效实施的偏好,确定基于自然的解决方案,以缓解拉姆萨尔指定地点的干旱。本文提出了一个分析层次过程的间隔版本,作为选择解决方案的系统框架,其中考虑了多个目标(减缓气候变化、保护生物多样性和人类福祉)以及适用于拉姆萨尔湿地的六个备选方案。塞尔维亚案例研究展示了在成对比较矩阵中使用区间值对替代方案进行评估,并通过线性规划计算优先权重。由三位专家确定的排名最靠前的措施包括增加水供应、支持农林业实践和利用天然水库。由于需要额外的实施投资,覆盖物和废水回用被排除在外。所提方法的附加值在于,管理者和决策者可以多种方式使用结果;例如,备选方案的权重可以说明资源分配情况,而排名则是优化应用解决方案数量的宝贵指标。
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引用次数: 0
Evaluation and projection of extreme precipitation using CMIP6 model simulations in the Yellow River Basin 利用 CMIP6 模型模拟评估和预测黄河流域极端降水量
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-16 DOI: 10.2166/wcc.2024.696
Heng Xiao, Yue Zhuo, Peng Jiang, Yan Zhao, Kaiwen Pang, Xiuyu Zhang
The capabilities of 23 global climate models (GCMs) from the Coupled Model Intercomparison Project Phase 6 were evaluated for six extreme precipitation indices from 1961 to 2010 using interannual variability and Taylor skill scores in the Yellow River Basin and its eight subregions. The temporal variations and spatial distributions of extreme precipitation indices were projected from 2021 to 2050 under the shared socioeconomic pathway scenarios (SSP2–4.5 and SSP5–8.5). The results show that most GCMs perform well in simulating extreme values (1-day maximum precipitation (RX1day) and 5-day maximum precipitation (RX5day)), duration (consecutive dry days), and intensity index (simple daily intensity index (SDII)), and perform poor in simulating the threshold indices (precipitation on very wet days (R95p) and number of heavy precipitation days (R10mm)). The projected changes in extreme precipitation indicate that under the SSP2-4.5 scenario, future extreme precipitation will increase by 15.7% (RX1day), 15.8% (RX5day), 30.3% (R95p), 1d (R10mm), and 6.6% (SDII), respectively, decrease by 2.1d (CDD). The aforementioned changes are further enhanced under the SSP5-8.5 scenario. Extreme precipitation changes widely in Hekou Town to Longmen, in the northeastern part of the region from Longmen to Sanmenxia, below Huayuankou, and in the interflow basin.
利用黄河流域及其八个分区的年际变率和泰勒技能评分,对耦合模式相互比较项目第六阶段的 23 个全球气候模式(GCM)的能力进行了评估,评估了 1961 年至 2010 年的六个极端降水指数。在共同的社会经济路径情景(SSP2-4.5 和 SSP5-8.5)下,预测了 2021 年至 2050 年极端降水指数的时间变化和空间分布。结果表明,大多数 GCM 在模拟极端值(1 天最大降水量(RX1 天)和 5 天最大降水量(RX5 天))、持续时间(连续干旱天数)和强度指数(简单日强度指数(SDII))方面表现良好,而在模拟阈值指数(极湿日降水量(R95p)和强降水日数(R10mm))方面表现较差。极端降水量的预测变化表明,在 SSP2-4.5 情景下,未来极端降水量将分别增加 15.7%(RX1 天)、15.8%(RX5 天)、30.3%(R95p)、1d(R10mm)和 6.6%(SDII),减少 2.1d(CDD)。在 SSP5-8.5 情景下,上述变化进一步加剧。极端降水在河口镇至龙门、龙门至三门峡东北部、花园口以下及间流盆地变化较大。
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引用次数: 0
Enhancing flood risk assessment in the Johor River Basin through trivariate copula 通过三变量 copula 加强柔佛河流域的洪水风险评估
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-12 DOI: 10.2166/wcc.2024.624
Naqibah Aminuddin Jafry, J. Suhaila, Fadhilah Yusof, Siti Rohani Mohd Nor, Nor Eliza Alias
Copulas are a vital statistical tool, particularly in hydrology, for understanding complex relationships among flood characteristics. This study focuses on three key flood features: peak discharge, flood volume, and flood duration, using trivariate copulas to capture their interdependencies. This is crucial because bivariate and univariate analyses fall short in considering all three factors simultaneously. To handle extreme flood values, L-moment is proposed over maximum likelihood estimation and inference function margin due to its enhanced reliability and susceptibility to outliers and extreme values. Akaike information criterion was employed to identify the best-fit marginal distribution and copula. The Lognormal distribution effectively models peak discharge, while Weibull and generalized extreme value distributions fit flood volume and duration best, respectively. Various copula families, including elliptical and Archimedean, are assessed, where Clayton copula emerge as the most suitable. This analysis demonstrates that when more flood features are considered together, the return period increases, indicating the reduced likelihood of occurrence. The trivariate case of the AND-joint return period surpasses the trivariate case of the OR-joint return period where the TP, V, DAND=5, 405.93 years, while TP, V, DOR=500.46 years. This comprehensive approach enhances hydrological modeling and decision-making for water resource management and flood mitigation projects.
协方差是一种重要的统计工具,尤其是在水文学领域,可用于理解洪水特征之间的复杂关系。本研究重点关注三个关键的洪水特征:峰值排水量、洪水流量和洪水持续时间,并使用三变量协方差来捕捉它们之间的相互依存关系。这一点至关重要,因为双变量和单变量分析无法同时考虑这三个因素。为了处理极端洪水值,建议使用 L-moment 而不是最大似然估计和推理函数边际,因为 L-moment 具有更高的可靠性,并且容易受到异常值和极端值的影响。采用 Akaike 信息准则来确定最佳拟合边际分布和协整分布。对数正态分布有效地模拟了洪峰流量,而魏布勒分布和广义极值分布分别最适合洪水流量和持续时间。对包括椭圆形和阿基米德形在内的各种 copula 系列进行了评估,其中克莱顿 copula 最为合适。该分析表明,当同时考虑更多洪水特征时,重现期会增加,表明洪水发生的可能性降低。AND 联合回归期的三变量情况超过 OR 联合回归期的三变量情况,其中 TP、V、DAND=5,405.93 年,而 TP、V、DOR=500.46 年。这种综合方法增强了水资源管理和防洪减灾项目的水文建模和决策能力。
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引用次数: 0
An inflection point-based method for estimating metrics of mangrove phenology combining climatic factors and Landsat NDVI time series 基于拐点的方法,结合气候因子和 Landsat NDVI 时间序列估算红树林物候指标
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-12 DOI: 10.2166/wcc.2024.463
Mounika Manne, R. K.
The present research evaluated the prospects of utilizing rainfall and temperature combined with Landsat-8 derived HANTS (Harmonic ANalysis of Time Series) reconstructed NDVI for estimating the metrics of the mangrove phenology. The selected period of the study was from 2013 to 2020 for the Pichavaram mangroves of Tamil Nadu. The NDVI and ERA5 (ECMWF Re-Analysis) datasets of rainfall and temperature were the input datasets for developing the new algorithm. The ‘z-score sum’ provided a measure of the cumulative impact of rainfall and temperature, displaying its most negative value coinciding with the peak positive value of the NDVI time series datasets. The algorithm developed for phenological metrics estimation identified the common inflection points of the z-score sum and NDVI curves. The temporal analysis of metrics revealed the average Length of Season (LoS) as 230 days. The metrics also identified the drought year 2016 with the shortest LoS and the least Gross Primary Productivity (GPP) values. The analysis showed the influences of the preceding year’s monsoon rainfall on the GPP values of the later part of the phenological cycle. The temperatures during the days of PoS were found to be the optimum temperature for the growth of mangroves.
本研究评估了利用降雨量和温度结合大地遥感卫星 8 号得出的 HANTS(时间序列谐波分析)重建 NDVI 估算红树林物候指标的前景。泰米尔纳德邦 Pichavaram 红树林的研究时间为 2013 年至 2020 年。NDVI 和 ERA5(ECMWF 再分析)降雨量和温度数据集是开发新算法的输入数据集。z 分值总和 "提供了降雨量和温度累积影响的衡量标准,其显示的最大负值与 NDVI 时间序列数据集的正值峰值相吻合。为估算物候指标而开发的算法确定了 zcore sum 和 NDVI 曲线的共同拐点。指标的时间分析表明,平均季节长度(LoS)为 230 天。这些指标还确定了 2016 干旱年的季节长度(LoS)最短,初级生产力总值(GPP)最小。分析表明,前一年的季风降雨量对物候周期后期的 GPP 值有影响。研究发现,物候期当天的温度是红树林生长的最佳温度。
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引用次数: 0
Assessing future changes in flood frequencies under CMIP6 climate projections using SWAT modeling: a case study of Bitlis Creek, Turkey 利用 SWAT 模型评估 CMIP6 气候预测下洪水频率的未来变化:土耳其比特里斯河案例研究
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-10 DOI: 10.2166/wcc.2024.646
Emrah Yalcin
Climate change is altering flood risk globally, with local variations prompting the necessity for regional assessments to guide the planning and management of water-related infrastructures. This study details an integrated framework for assessing future changes in flood frequencies, using the case of Bitlis Creek (Turkey). The precipitation and temperature simulations of 21 global circulation models (GCMs) from the coupled model intercomparison project phase 6 (CMIP6) are used to drive the developed soil and water assessment tool (SWAT) model in generating daily streamflow projections under the CMIP6 historical experiment and the shared socio-economic pathway (SSP) scenarios of SSP245 and SSP585. Five probability distribution functions are considered to calculate the 5-, 10-, 25-, 50-, 100-, and 500-year flood discharges for the historical period 1955–2010 and the future periods 2025–2074 and 2025–2099. The quantification of climate change impacts on the design discharges is based on the medians of the flood discharges obtained for the climate data of each GCM, using the best-fitted distribution functions according to the Kolmogorov–Smirnov test results. The findings illustrate significant increases in discharge rates, ranging from 21.1 to 31.7% for the 2025–2099 period under the SSP585 scenario, highlighting the necessity of considering changing climate conditions in designing water-related infrastructures.
气候变化正在改变全球范围内的洪水风险,而各地的差异又促使人们有必要进行区域评估,以指导与水有关的基础设施的规划和管理。本研究以比特里斯河(土耳其)为例,详细介绍了评估未来洪水频率变化的综合框架。在 CMIP6 历史实验以及 SSP245 和 SSP585 的共享社会经济路径 (SSP) 情景下,21 个全球环流模型 (GCM) 的降水和温度模拟被用于驱动已开发的水土评估工具 (SWAT) 模型生成每日溪流预测。在计算 1955-2010 年历史时期以及 2025-2074 年和 2025-2099 年未来时期的 5 年、10 年、25 年、50 年、100 年和 500 年洪水流量时,考虑了五种概率分布函数。根据 Kolmogorov-Smirnov 检验结果,使用最佳拟合分布函数对每个 GCM 的气候数据所获得的洪水排放量的中值进行量化,从而确定气候变化对设计排放量的影响。研究结果表明,在 SSP585 情景下,2025-2099 年期间的排水率大幅增加了 21.1% 至 31.7%,这突出表明在设计与水有关的基础设施时必须考虑不断变化的气候条件。
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引用次数: 0
The prediction of precipitation changes in the Aji-Chay watershed using CMIP6 models and the wavelet neural network 利用 CMIP6 模型和小波神经网络预测阿吉-恰伊流域的降水变化
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-09 DOI: 10.2166/wcc.2024.607
Farahnaz Khoramabadi, Sina Fard Moradinia
Greenhouse gases affect climate system disturbances. This research employs sixth generation CMIP6 models in the SSP5.85 scenario and extends the use of the neural wavelet network to predict precipitation variations for the future (2025–2065). Kendall's trend test is used to assess changes in precipitation trends for observed and projected periods. An analysis of variance (ANOVA) validates models under SSP5.85 by comparing observed precipitation with model predictions. A multi-layer perceptron neural network assesses climate change's impact on future precipitation. Findings indicate future precipitation is projected to fluctuate from −0.146 to over −2.127 mm compared to the baseline period. The observed period showed a significant 3.37% monthly precipitation decrease within the watershed. The CanESM5 model predicts a 3.916 reduction in precipitation with 95% confidence, while INM-CM4-8 and MRI-ESM2-0 models are less certain. The minor difference between CanESM5's predicted (−5.91) and observed (−5.05) precipitation suggests a slight variance. On the other hand, the wavelet neural network (WNN) model predicts that precipitation in this region will increase in the future. In general, this study predicts a decrease in precipitation for the Aji-Chay watershed in Iran over the next decade, could lead to serious issues like lower crop yields, rising food prices, and even droughts.
温室气体影响气候系统扰动。这项研究采用了 SSP5.85 情景下的第六代 CMIP6 模型,并扩展使用了神经小波网络来预测未来(2025-2065 年)的降水变化。肯德尔趋势检验用于评估观测和预测期间降水趋势的变化。方差分析(ANOVA)通过比较观测降水量和模型预测值,验证了 SSP5.85 下的模型。多层感知器神经网络评估了气候变化对未来降水的影响。研究结果表明,与基线期相比,未来降水量预计将从-0.146 毫米波动到超过-2.127 毫米。观测期间,流域内的月降水量大幅减少了 3.37%。CanESM5 模型预测降水量将减少 3.916 毫米,置信度为 95%,而 INM-CM4-8 和 MRI-ESM2-0 模型则不太确定。CanESM5 预测降水量(-5.91)与观测降水量(-5.05)之间的微小差异表明存在轻微差异。另一方面,小波神经网络(WNN)模式预测该地区未来降水量将增加。总体而言,本研究预测未来十年伊朗阿吉-恰伊流域的降水量将减少,这可能会导致农作物减产、食品价格上涨甚至干旱等严重问题。
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引用次数: 0
A synergistic framework for dynamic water scarcity assessment: integrated blue and green water 动态缺水评估的协同框架:蓝色和绿色综合水体
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-08 DOI: 10.2166/wcc.2024.728
Jianwei Liu, Xiaoteng Pang, Xiaohui Yan, Xiaoqiang Chen, Mingwei Wang, Ruixue Ma, Liguo Ma
Dynamic assessment of water scarcity utilising blue water (BW) and green water (GW) can enhance water resource management. The traditional water scarcity assessment mainly considers blue water, ignoring GW, for static evaluation. The improvement objective of this study is dynamically quantifying water scarcity, integrated BW and GW. This study proposed a framework to present an overview of water scarcity within multiple indicators and pinpoint water-stressed areas within an ever-changing process. The framework is based on the theorem of mutual change of quality and quantity to assess the spatiotemporal variability of BW and GW availability and to quantify the water scarcity in watersheds. A case study was carried out in Taoer River Basin, a semiarid region of China, to demonstrate the use of the framework. The anthropogenic elements (such as water demand) and natural conditions were combined to quantify water scarcity, as measured by BW and GW scarcity indices. This study also analysed the variation of water scarcity on different spatiotemporal scales. The findings demonstrate that severe water scarcity has been occurring downstream with a tendency towards upstream of the watershed. Collectively, this study provides a useful tool for dynamic water scarcity assessment, helping develop policies to promote sustainable development.
利用蓝水(BW)和绿水(GW)对水资源短缺进行动态评估,可以加强水资源管理。传统的缺水评估主要考虑蓝水,忽略了绿水,进行静态评估。本研究的改进目标是综合蓝水和绿水,动态量化缺水程度。本研究提出了一个框架,在不断变化的过程中,通过多个指标展现水资源短缺的概况,并准确定位水资源紧张地区。该框架以水质和水量互变定理为基础,用于评估基本水量和一般水量可用性的时空变化,并量化流域缺水状况。在中国半干旱地区洮儿河流域开展了一项案例研究,以演示该框架的使用。将人为因素(如需水量)和自然条件结合起来,量化了缺水程度,并用 BW 和 GW 缺水指数进行了衡量。这项研究还分析了不同时空尺度上水资源短缺的变化情况。研究结果表明,严重缺水一直发生在下游,并有向流域上游发展的趋势。总之,这项研究为动态缺水评估提供了有用的工具,有助于制定促进可持续发展的政策。
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引用次数: 0
Rainfall prediction for data scares areas using metrological satellites in the case of the Lake Tana sub-basin, Ethiopia 以埃塞俄比亚塔纳湖分流域为例,利用气象卫星对数据恐慌地区进行降雨预测
IF 2.8 4区 环境科学与生态学 Q2 Environmental Science Pub Date : 2024-04-08 DOI: 10.2166/wcc.2024.636
Shimalis Sishah Dagne, Zenebe Reta Roba, Mitiku Badasa Moisa, Kiros Tsegay Deribew, D. O. Gemeda, Hurgesa Hundera Hirpha
In African nations with complex topographies, alternative rainfall estimation methods such as satellites are crucial. This study is aimed at predicting the spatial and temporal distribution of rainfall in the Lake Tana sub-basin from 1990 to 2020. A satellite-based rainfall estimate of Climate Hazards Group Infrared Precipitation with Station data (CHIRPS) was used with the same spanning period (1990–2020). The validation process employs point-to-pixel analysis, comparing CHIRPS estimates with observed data at specific gauge stations. The findings showed that CHIRPS had well-estimated rainfall incidence in the highland areas and significantly overestimated it in the lowland areas. The Mann–Kendall trends for January, June, and August indicate decreasing trends, while the Bega and spring seasons show notable declines. Regression analysis reveals a non-significant decrease in annual rainfall with the highest rainfall in the summer and relatively dry winters. In addition, the coefficient of variation value of 26.37% suggests a moderate level of variability around the mean annual rainfall. In conclusion, the CHIRPS satellite exhibited varied performance across the Tana Sub-basin, with site-specific discrepancies and notable inaccuracies at certain stations. The study underscores the importance of considering local factors and topography in satellite-based rainfall assessments, providing valuable insights for agricultural planning in the region.
在地形复杂的非洲国家,卫星等其他降雨量估算方法至关重要。本研究旨在预测塔纳湖分流域 1990 年至 2020 年的降雨量时空分布。在相同的时间跨度(1990-2020 年)内,使用了基于气候灾害小组红外降水站数据(CHIRPS)的卫星降雨量估算。验证过程采用点到像素分析,将 CHIRPS 估算值与特定测站的观测数据进行比较。结果表明,CHIRPS 对高原地区的降雨发生率估计准确,而对低洼地区的降雨发生率估计明显偏高。1 月、6 月和 8 月的 Mann-Kendall 趋势表明降雨量呈下降趋势,而贝加和春季的降雨量则明显下降。回归分析表明,年降雨量下降不明显,夏季降雨量最大,冬季相对干燥。此外,26.37% 的变异系数值表明,年平均降雨量的变异程度适中。总之,CHIRPS 卫星在整个塔纳河流域表现出不同的性能,在某些站点存在特定的差异和明显的误差。这项研究强调了在基于卫星的降雨量评估中考虑当地因素和地形的重要性,为该地区的农业规划提供了宝贵的见解。
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