摘要
针对新建或待建水库群实测径流系列不足的问题,采用MODSIM-DSS模拟生成拉萨河干流5座梯级水库群建设后的日径流系列,采用水文变异指标法及变化范围法(IHA-RVA),分析现状和规划期的拉萨河水文情势变化。结果表明,拉萨河水库群对单项水文指标的累积影响有正有负,单项指标改变度最大月份的为3月和10月,月平均流量的改变度均大于0.9,属于重度改变;现状条件下唐加水文站水文情势综合改变度为0.21,为轻度改变,重度改变指标占总指标数量7.8%;规划期唐加水文站的水文情势综合改变度为0.41,为中度改变,重度改变指标占总指标数量28.1%;综合改变度随库容系数的增大而增大,增大速率呈现“小大小”的特征。
To solve the problem of insufficient measured runoff data for new-built or to-be-built cascade reservoirs,five comparable daily runoff series of the Lhasa River were generated by using MODSIM-DSS for the post construction scenario.The indicators of hydrologic alteration and range of variability approach(IHA-RVA)was used to analyze the hydrological regime variation of the Lhasa River during the current situation and in the planning period.The results show that the cascade reservoirs have positive or negative accumulated impacts on a single indicator.The severest changing degree for a single indicator occurs in March and October,during which the changing degree of the monthly averaged discharges are both greater than 0.9,being regarded as a severe change.The comprehensive hydrologic changing degree(CHCD)in the current situation is 0.21,belonging to a slight change,in which the severe changed indicators account for 7.8%of the total number.The CHCD in the planning year is 0.41,belonging to a medium change,and the severe changed indicators account for 28.1%of the total number.The CHCD increases as the increase of the total storage coefficient with a slow-fast-slow increasing rate.
作者
黄草
黄梦迪
胡铁松
胡国华
李志威
HUANG Cao;HUANG Mengdi;HU Tiesong;HU Guohua;LI Zhiwei(School of Hydraulic Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China;Hunan Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration,Changsha 410114,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)
出处
《水利水电科技进展》
CSCD
北大核心
2020年第1期64-70,共7页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(51709019
91647204)
湖南省自然科学基金(20195550667)
关键词
梯级水库
水文情势
IHA-RVA
综合改变度
拉萨河
cascade reservoir
hydrological regime
IHA-RVA
comprehensive hydrologic changing degree
Lhasa River
