四川省大型湖泊和水库水体长时序时空变化分析

Long Time Series Spatio-temporal Change Analysis of Water Bodies of Large Lakes and Reservoirs in Sichuan Province

采用2000—2020年欧盟委员会联合研究中心发布的逐年地表永久水体和季节水体数据集,分析了四川省30个大型湖泊和102个大型水库(水体面积在1 km^(2)以上)的水体时空变化特征,探究了水体与降水和陆地水储量的关系。研究结果表明,2000—2020年大型湖泊和水库整体均呈永久水体面积增加、季节水体面积减少的变化趋势;从个体尺度来看,12个大型湖泊的永久水体面积显著增加,7个大型湖泊的季节水体面积显著减少,89个大型水库的永久水体面积显著增加,43个大型水库的季节水体面积显著减少。大型湖泊和水库的永久水体与年降水量、陆地水储量均存在较高的正相关性,相关系数分别达到0.68和0.90。

We used the Joint Research Center of European Commission yearly permanent and seasonal water body dataset from 2000 to 2020 to analyze the spatio-temporal changes of water bodies in 30 large lakes and 102 large reservoirs(water areas more than 1 km^(2))in Sichuan Province.Then,we investigated the relationships between water bodies and precipitation and terrestrial water storage.The results indicated that from 2000 to 2020,both large lakes and large reservoirs showed an increasing and a decreasing trend in permanent and seasonal water bodies,respectively.At the individual scale,12 large lakes showed a significant increase in permanent water body,7 large lakes showed a significant decrease in seasonal water body,89 large reservoirs showed a significant increase in permanent water body,and 43 large reservoirs showed a significant decrease in seasonal water body.The permanent water bodies of large lakes and reservoirs had a high positive correlation with annual precipitation(correlation coefficient is 0.68)and terrestrial water storage(correlation coefficient is 0.90).