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Changes in intra-annual runoff and its response to climate variability and anthropogenic activity in the Lake Issyk-Kul Basin, Kyrgyzstan
Catena ( IF 5.4 ) Pub Date : 2020-11-10 , DOI: 10.1016/j.catena.2020.104974
Yilinuer Alifujiang , Jilili Abuduwaili , Michael Groll , Gulnura Issanova , Balati Maihemuti

An attribute study of the runoff changes due to climate change and anthropogenic activities is of great value to determining the best response to runoff changes. This study investigates the evolution of the intra-annual runoff and evaluates the effects of changes in climate and anthropogenic activities on runoff variations in the Lake Issyk-Kul Basin (LIKB). The monotonic trend test and wavelet transform analysis were used to characterize the trends and periods of the hydro-meteorological variables in the LIKB. In addition, the periodicity-trend superposition model and double-mass curves were used to assess the contributions of climate change and anthropogenic activities to runoff variations. The analyses were conducted using regional climate data combined with runoff data derived from 13 different river stations in the LIKB for the period between 1943 and 2012. The results indicate the following. (1) The monthly runoff trends in the three groups of tributaries (northern, southeastern, and southern tributaries) exhibit distinct differences, and the percentage of the data sets with no pattern gradually increased (from 26% to 38%) from north to south. There is a positive trend, with a similar decrease (from 50% to 24%) from north to south. (2) The air temperature, precipitation, and runoff in the LIKB increased throughout the low and high flow periods. The statistical index of the runoff concentration degree (RCD) decreased at most stations (Chong-Koi-Suu, Chong-Ak-Suu, Chong-Urykty, Pzhergalan, Ak-Sai, Tossor, Ton, Chong-Kyzyl-Suu, Tamga, and Karakol), except for the Cholpon-Ata, Ak-Suu, and Dzhuuku stations. (3) In addition, the periodic characteristics of the RCD show that the RCD has a 12-year significant period over the low flow period, which is similar to that for precipitation but varies from that for air temperature. (4) Climate variability and anthropogenic activities are two different contributors to runoff reduction in the LIKB. The respective contributions of anthropogenic activities to the runoff determined using the two methods were 35.3% and 18%, whereas the climate change contributions were 64.7% and 82%, respectively. Climate change was the main reason for the runoff variations. These results provide a basis for the scientific management and sustainable allocation of water resources in the LIKB.



中文翻译:

吉尔吉斯斯坦伊塞克湖流域年内径流量的变化及其对气候变化和人类活动的响应

关于气候变化和人为活动引起的径流变化的属性研究对于确定对径流变化的最佳响应具有重要价值。这项研究调查了年内径流量的演变,并评估了气候和人为活动的变化对伊塞克湖盆地(LIKB)径流量变化的影响。用单调趋势检验和小波变换分析来表征LIKB中水文气象变量的趋势和周期。此外,周期性趋势叠加模型和双质量曲线被用来评估气候变化和人为活动对径流变化的贡献。分析是使用区域气候数据以及来自LIKB的13个不同河站的1943年至2012年期间的径流数据进行的。结果表明以下结果。(1)三支支流(北支,东南支流和南支支流)的月径流量趋势显示出明显的差异,无模式数据集的百分比从北向南逐渐增加(从26%到38%) 。这是一个积极的趋势,北到南的下降趋势相似(从50%下降到24%)。(2)在低流量和高流量期间,LIKB中的气温,降水和径流都增加了。多数站(崇爱,苏克,苏克,乌克提,佩杰加兰,阿克赛,托索,吨,崇克苏尔,Tamga和Karakol),但Cholpon-Ata,Ak-Suu和Dzhuuku站除外。(3)此外,RCD的周期性特征表明,RCD在低流量时期具有12年的有效期,这与降水相似,但与气温不同。(4)气候变化和人为活动是LIKB径流减少的两个不同因素。两种方法确定的人为活动对径流的贡献分别为35.3%和18%,而气候变化贡献分别为64.7%和82%。气候变化是径流变化的主要原因。这些结果为LIKB中水资源的科学管理和可持续分配提供了基础。和Dzhuuku站。(3)此外,RCD的周期性特征表明,RCD在低流量时期具有12年的有效期,这与降水相似,但与气温不同。(4)气候变化和人为活动是LIKB径流减少的两个不同因素。两种方法确定的人为活动对径流的贡献分别为35.3%和18%,而气候变化贡献分别为64.7%和82%。气候变化是径流变化的主要原因。这些结果为LIKB中水资源的科学管理和可持续分配提供了基础。和Dzhuuku站。(3)此外,RCD的周期性特征表明,RCD在低流量时期具有12年的有效期,这与降水相似,但与气温不同。(4)气候变化和人为活动是LIKB径流减少的两个不同因素。两种方法确定的人为活动对径流的贡献分别为35.3%和18%,而气候变化贡献分别为64.7%和82%。气候变化是径流变化的主要原因。这些结果为LIKB中水资源的科学管理和可持续分配提供了基础。RCD的周期性特征表明,RCD在低流量时期具有12年的有效期,这与降水相似,但与气温不同。(4)气候变化和人为活动是LIKB径流减少的两个不同因素。两种方法确定的人为活动对径流的贡献分别为35.3%和18%,而气候变化贡献分别为64.7%和82%。气候变化是径流变化的主要原因。这些结果为LIKB中水资源的科学管理和可持续分配提供了基础。RCD的周期性特征表明,RCD在低流量时期具有12年的有效期,这与降水相似,但与气温不同。(4)气候变化和人为活动是LIKB径流减少的两个不同因素。两种方法确定的人为活动对径流的贡献分别为35.3%和18%,而气候变化贡献分别为64.7%和82%。气候变化是径流变化的主要原因。这些结果为LIKB中水资源的科学管理和可持续分配提供了基础。(4)气候变化和人为活动是LIKB径流减少的两个不同因素。两种方法确定的人为活动对径流的贡献分别为35.3%和18%,而气候变化贡献分别为64.7%和82%。气候变化是径流变化的主要原因。这些结果为LIKB中水资源的科学管理和可持续分配提供了基础。(4)气候变化和人为活动是LIKB径流减少的两个不同因素。两种方法确定的人为活动对径流的贡献分别为35.3%和18%,而气候变化贡献分别为64.7%和82%。气候变化是径流变化的主要原因。这些结果为LIKB中水资源的科学管理和可持续分配提供了基础。

更新日期:2020-11-12
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