【摘要】 基于1955年、1978年、1990年、2008年、2016年5个时期的河网单位面积槽蓄容量和单位面积可调蓄容量、河网槽蓄容量和可调蓄容量4个指标参数,对比分析了三口地区水系调蓄能力时空变化,运用相关分析法剖析了水系结构与调蓄能力的关系。结果表明:①河网槽蓄容量由1955年的9 548.52万m~3减至2016年的7 049.01万m~3,减少了26.17%;河网可调蓄容量由1955年的4 696.39万m~3逐渐减至2016年的2 461.13万m~3,共减少47.59%。②河网单位面积槽蓄容量和河网单位面积可调蓄容量具有明显的等级差异,单位面积可调蓄容量以低等级河流(1、2、3级)减少幅度最大,而4级和5级河流的调蓄能力各指标参数减少值相对较低。③在5个时期中各水系区河网槽蓄能力和可调蓄能力均呈不断下降的态势,其中以藕池河水系区衰退程度最大,河网单位面积槽蓄能力和单位面积可调蓄能力最弱的是虎渡河水系区。④水系调蓄能力与河网结构特征、河流水文连通、水系连通度、水系连通性均在0.01水平上,呈显著正相关。更多还原

【Abstract】 Based on four index parameters of tank storage capacity per unit area, adjustable storage capacity per unit area, channel storage capacity in river network and adjustable storage capacity in 1955, 1978, 1990, 2008 and 2016, the spatial and temporal variations of water system storage capacity in Jingnan Three Port of Yangtze River are compared and analyzed,and the relationship between water system structure and storage capacity is analyzed by correlation analysis method. The results show that:(1) The storage capacity of river network channel decreased by 26.17% from 9 548.52×10~4 m~3 in 1955 to 7 049.01×10~4 m~3 in 2016. The adjustable storage capacity of river network gradually decreased from 4 696.39×10~4 m~3 in 1955 to 2 461.13×10~4 m~3 in 2016, a total decrease of 47.59%.(2) There are obvious gradation differences between channel storage capacity per unit area of river network and adjustable storage capacity per unit area of river network. The adjustable storage capacity per unit area of the low-grade River(grades 1, 2 and 3) decreases the most, while the parameters of the four-grade and five-grade rivers decrease relatively low.(3)In the five periods, the storage capacity and adjustable storage capacity of the river network in each river system area have been declining. Among them, the decline of the Ouchi river system area is the greatest, and the lowest of the channel storage capacity and adjustable storage capacity per unit area of the river network is the Hudu River system area.(4) There is a significant positive correlation between water system storage capacity and the structure characteristics of river network, river hydrological connectivity, and connectivity degree of river network and river network connection at the level of 0.01.更多还原