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基于气候变化和人类用水影响下蒸散发及地下水重建的黄河流域水循环关键过程变化

批准号41705072 学科分类气候学与气候预测 ( D0507 )
项目负责人吕美霞 负责人职称博士后 依托单位中国科学院大气物理研究所
资助金额25.00
万元
项目类别青年科学基金项目 研究期限2018 年 01 月 01 日 至
2020 年 12 月 31 日
中文主题词黄河流域;气候变化;人类用水;蒸散发重建;地下水估计
英文主题词Yellow River basin;Climate change;Human water use;Evapotranspiration reconstruction;Groundwater estimation

摘要

中文摘要 受气候变化和人类活动共同影响,黄河流域的水循环正在发生显著变化。但观测数据的缺乏阻碍了区域水循环变化过程和机制的研究,如区域蒸散发数据的获取一直是公认的难题,流域内剧烈的人类活动改变了地表水体的分布状况,使蒸散发的准确估计更加困难。为此,本项目拟利用陆面模式、人类用水、水文气候观测及遥感数据为基础,首先基于陆面模式模拟的蒸散发、灌溉用水、观测降水及天然径流,重建黄河流域气候变化和灌溉影响下的实际蒸散发,采用考虑GRACE陆地水储量的水量平衡方程检验重建结果的数据质量,通过多源数据的综合利用减小重建结果的不确定性;其次,利用重建的蒸散发和观测土壤水,基于水量平衡原理,估算黄河流域的地下水变化,并与利用GRACE陆地水储量推求的地下水结果进行对比分析;最后,基于获得的蒸散发和地下水数据,分析黄河流域水循环关键过程的变化特征及相互联系。本项目的实施对黄河流域的水循环研究及水资源管理具有重要意义。
英文摘要 The water cycle of the Yellow River basin has been changing extensively under the impacts of climate change and human activity. However, studies on the variation and mechanism of regional water cycle have been greatly limited by the lack of observations. For instance, regional evapotranspiration (ET) is always difficult to obtain. For the Yellow River basin, the extensive human interventions have altered the spatial distribution of surface water body, which makes the accurate estimation of ET more difficult. To overcome this, this study is proposed based on land-surface models, human water use, hydrometeorology measurements, and remote sensing data. First, the ET will be reconstructed using the simulated ET from land-surface models, the irrigation water, observed precipitation, and the naturalized streamflow to reduce the ET uncertainty by using multi-source datasets. The reconstructed ET will be evaluated using the water-balance equation with the terrestrial water storage change (TWSC), which is derived from the Gravity Recovery and Climate Experiment (GRACE), being taken into account. Second, the groundwater change will be estimated from the water-balance equation using the reconstructed ET and measured soil moisture. The estimated groundwater change will be compared with the result isolated from GRACE-TWSC. Finally, the variations of crucial water cycle processes and relationships among them will be discussed based on the obtained ET and groundwater. The implement of this study can provide guidance for the water cycle study and water resource management for the Yellow River basin.
结题摘要

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