关键词: 洪水调蓄能力; 防洪库容; 核密度函数; 时空演化规律; 时空分异特征; 水库工程; 湖南省;

Abstract: A spatial database of reservoirs in Hunan Province is established, and the spatial-temporal evolution laws of reservoirs are analyzed by kernel density method.The flood control storage capacity is selected as an evaluation index of reservoir flood regulation and storage capacity to studying the spatial-temporal variation characteristics of reservoir flood regulation and storage capacities in Hunan Province.The results show that:(1) There are a large number of reservoirs in Hunan Province, with a total storage capacity of 51.412 billion m3,of which small reservoirs accounts for 97%.Most of them were built in the 1950 s to 1970 s, and since the 21 st century, the constructions are mainly focused on large and medium-sized reservoir projects.(2) The distribution of the reservoirs is closely related to the topographic and landform features, mainly in hilly region, mound around the Dongting Lake and intermountain basins with the altitude of 50～1 000 m.(3) The flood control storage capacity of all the reservoirs in Hunan Province is 10.6 billion m3,the flood regulation and storage is dominated by large reservoirs accounting for nearly 70%.From the perspective of spatial distribution pattern, the flood control capacity of reservoirs in Yuanjiang Basin is the strongest, accounting for nearly 40% of the total storage.The flood control capacity of reservoirs in Huaihua, Zhangjiajie and Changde City, located in the northwest of Hunan Province, accounts for more than 50% of the total storage.(4) The reservoir flood regulation and storage capacity was improved most significantly in the 1990 s and 1970 s, with an proportions of increment storage capacity of 28.1% and 18.3% respectively.In the low tide period of reservoir construction in 1980 s, the proportions of increment storage capacity accounted for only 3.4%.

Key words: flood regulation and storage capacity of reservoir; flood control capacity; kernel density method; spatial-temporal evolution law; temporal and spatial differentiation; reservoir project; Hunan Province;