Lakes and reservoirs are important components of freshwater. The expansion and shrinkage of lakes/reservoirs may have impacts on meteorological characteristics and the underlying surface conditions in the surrounding areas, which would further affect energy and water vapor fluxes. In this study, the expansion and shrinkage of the Guanting Reservoir during 2013–2017 were analyzed using remote sensing data. Data collected from the Huailai Remote Sensing Experiment Station were used to analyze the impact of reservoir expansion/shrinkage on energy and water vapor fluxes in the surrounding area. Results showed the annual expansion of the Guanting Reservoir from 2013 to 2017 and a seasonal variation characterized by expansion in spring, shrinkage in summer and autumn, and expansion again in winter was exhibited. Meanwhile, the evapotranspiration (ET) in the surrounding area increased by about 96%, from 446.6 mm in 2013 to 874.7 mm in 2017. In growing season (May to September), the seasonal shrinkage of the reservoir affected ET through net radiation, normalized difference vegetation index (NDVI), and deep soil moisture, while in nongrowing season (January to April and October to December), the seasonal expansion increased ET through the distance between 40‐m tower and the reservoir, net radiation, and surface soil moisture. In addition, with the reservoir expanding year by year, the difference in ET between the closer site and further site from the reservoir increased obviously, especially in the nongrowing season during the seasonal expansion of the reservoir. The findings of this study are beneficial for ecosystem restoration and sustainable development of lakes/reservoirs in arid and semiarid areas.

中文翻译：

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湖泊/水库的膨胀和收缩对周围地区能量和水蒸气通量的影响

湖泊和水库是淡水的重要组成部分。湖泊/水库的膨胀和收缩可能对周围地区的气象特性和潜在的地表条件产生影响，这将进一步影响能量和水蒸气通量。在这项研究中，利用遥感数据分析了官厅水库在2013-2017年期间的膨胀和收缩。从怀来遥感实验站收集的数据用于分析储层膨胀/收缩对周围区域能量和水汽通量的影响。结果表明，官厅水库从2013年到2017年年均扩张，呈现春季扩张，夏季，秋季萎缩，冬季再次扩张的季节变化。与此同时，周围地区的蒸散量（ET）增加了约96％，从2013年的446.6毫米增加到2017年的874.7毫米。在生长季节（5月至9月），水库的季节收缩通过净辐射，归一化差异植被影响了ET指数（NDVI）和深层土壤湿度，而在非生长季节（1月至4月以及10月至12月），季节性膨胀通过40米塔与水库之间的距离，净辐射和表层土壤湿度增加了ET。此外，随着水库的逐年扩大，靠近水库的站点和远离水库的站点之间的ET差异明显增加，尤其是在水库季节扩展期间的非生长期。