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Hydroclimatic Extremes in the Limpopo River Basin, South Africa, under Changing Climate
Water ( IF 3.0 ) Pub Date : 2020-11-24 , DOI: 10.3390/w12123299
Christina M. Botai , Joel O. Botai , Nosipho N. Zwane , Patrick Hayombe , Eric K. Wamiti , Thabo Makgoale , Miriam D. Murambadoro , Abiodun M. Adeola , Katlego P. Ncongwane , Jaco P. de Wit , Michael G. Mengistu , Henerica Tazvinga

This research study evaluated the projected future climate and anticipated impacts on water-linked sectors on the transboundary Limpopo River Basin (LRB) with a focus on South Africa. Streamflow was simulated from two CORDEX-Africa regional climate models (RCMs) forced by the 5th phase of the Coupled Model Inter-Comparison Project (CMIP5) Global Climate Models (GCMs), namely, the CanESM2m and IPSL-CM5A-MR climate models. Three climate projection time intervals were considered spanning from 2006 to 2099 and delineated as follows: current climatology (2006–2035), near future (2036–2065) and end of century future projection (2070–2099). Statistical metrics derived from the projected streamflow were used to assess the impacts of the changing climate on water-linked sectors. These metrics included streamflow trends, low and high flow quantile probabilities, the Standardized Streamflow Index (SSI) trends and the proportion (%) of dry and wet years, as well as drought monitoring indicators. Based on the Mann-Kendall (MK) trend test, the LRB is projected to experience reduced streamflow in both the near and the distant future. The basin is projected to experience frequent dry and wet conditions that can translate to drought and flash floods, respectively. In particular, a high proportion of dry and a few incidences of wet years are expected in the basin in the future. In general, the findings of this research study will inform and enhance climate change adaptation and mitigation policy decisions and implementation thereof, to sustain the livelihoods of vulnerable communities.

中文翻译:

气候变化下南非林波波河流域的极端水文气候

本研究评估了未来气候的预测以及对跨界林波波河流域 (LRB) 与水相关部门的预期影响,重点是南非。水流是根据耦合模式比对项目 (CMIP5) 全球气候模式 (GCM) 第 5 阶段强制执行的两个 CORDEX-非洲区域气候模式 (RCM) 模拟的,即 CanESM2m 和 IPSL-CM5A-MR 气候模式。考虑了从 2006 年到 2099 年的三个气候预测时间间隔,其划分如下:当前气候学(2006-2035)、近期(2036-2065)和世纪末未来预测(2070-2099)。来自预测流量的统计指标用于评估气候变化对与水相关的部门的影响。这些指标包括流量趋势、低和高流量分位数概率、标准化流量指数 (SSI) 趋势和干湿年份比例 (%) 以及干旱监测指标。根据 Mann-Kendall (MK) 趋势测试,预计 LRB 在不久的将来都会经历减少的流量。预计该盆地将经历频繁的干燥和潮湿条件,这可能分别转化为干旱和山洪暴发。特别是,预计未来流域将出现高比例的旱年和少量的雨年。总的来说,这项研究的结果将为气候变化适应和减缓政策决策及其实施提供信息和加强,以维持脆弱社区的生计。标准化径流指数(SSI)趋势和干湿年比例(%),以及干旱监测指标。根据 Mann-Kendall (MK) 趋势测试,预计 LRB 在不久的将来都会经历减少的流量。预计该盆地将经历频繁的干燥和潮湿条件,分别会转化为干旱和山洪暴发。特别是,预计未来流域将出现高比例的旱年和少量的雨年。总的来说,这项研究的结果将为气候变化适应和减缓政策决策及其实施提供信息和加强,以维持脆弱社区的生计。标准化径流指数(SSI)趋势和干湿年比例(%),以及干旱监测指标。根据 Mann-Kendall (MK) 趋势测试,预计 LRB 在不久的将来都会经历减少的流量。预计该盆地将经历频繁的干燥和潮湿条件,这可能分别转化为干旱和山洪暴发。特别是,预计未来流域将出现高比例的旱年和少量的雨年。总的来说,这项研究的结果将为气候变化适应和减缓政策决策及其实施提供信息和加强,以维持脆弱社区的生计。预计 LRB 在不久的将来都会经历减少的流量。预计该盆地将经历频繁的干燥和潮湿条件,分别会转化为干旱和山洪暴发。特别是,预计未来流域将出现高比例的旱年和少量的雨年。总的来说,这项研究的结果将为气候变化适应和减缓政策决策及其实施提供信息和加强,以维持脆弱社区的生计。预计 LRB 在不久的将来都会经历减少的流量。预计该盆地将经历频繁的干燥和潮湿条件,这可能分别转化为干旱和山洪暴发。特别是,预计未来流域将出现高比例的旱年和少量的雨年。总的来说,这项研究的结果将为气候变化适应和减缓政策决策及其实施提供信息和加强,以维持脆弱社区的生计。
更新日期:2020-11-24
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