摘要
采用变化范围法(RVA)定量研究了丹江口水库蓄水后汉江中下游水文情势的时空变化,评估出汉江干流变化度最大的江段和水文特征指标类别,分析了其对应的生态影响,并针对汉江流域的四大家鱼和水华问题进行了敏感水文指标的变化度分析。结果显示:丹江口大坝蓄水后,汉江下游河道流量是中变化度占主导,比例范围为47~63%;水位是高变化度占主导,襄阳站和皇庄站高变化度的水文指标所占比例远大于其它站点,依次为53%和75%,各站水位较蓄水前下降了1~2 m。黄家港站高/低流量脉冲出现的频率减少(变化度为-0.49和-0.62),且持续的时间变短(变化度为-0.87和-0.74)。皇庄站和襄阳站流量和水位的月均值和极值较蓄水前减少,逆转次数在高RVA范围内较蓄水前增加(变化度为1.82)。四大家鱼产卵的敏感水文指标出现频率较蓄水前减少,且为中高变化度。下游河道枯水期流量和水位减小,增加了水华发生几率。
The Range of Variability Approach is used to quantitatively estimate the temporal and spatial variation of the hydrologic regime in the middle-section of the Hanjiang River after the impoundment of the Danjiangkou Reservoir. The results show the highest Indicators of Hydrology Alteration（ IHA） in different stations and IHA groups,as well as the corresponding ecological impacts. It is demonstrated that the degree of discharge alteration in the lower reaches of Hanjiang River is rather moderate（ range from 47% to 63%）,the degree of water surface elevation alteration is rather high,Xiang Yang and Huang Zhuang have highest alteration of water surface elevation（ proportion is 53% and 75%）. More specifically,the water surface elevation decreased significantly at all stations（ decreased 1 ~ 2 m）. The frequency and duration of high/low flow pulses in Huangjiagang station of decreased（ IHA is-0. 49/-0. 62 and-0. 87/-0. 74）. The monthly mean and extreme values of discharge and water surface elevation at Huangzhuang and Xiangyang stations decreased,the frequency of discharge reversal magnitude increased（ IHA is 1. 82 in high RVA range）. The occurrence of those Indicators that captured the effects of IHA on the four major Chinese carps was less frequent during the post-dam construction period compared to that before the impoundment. The discharge and water surface elevation of the lower reaches decreased during the dry season,thus increasing the possibility of water bloom occurrence.
作者
柏慕琛
班璇
DIPLAS Panayiotis
肖飞
BAI Mu-chen BAN Xuan DIPLAS Panayiotis XIAO Fei(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China Hubei Provincial Collaborative Innovation center for Water Resources Security, Wuhan 430072, China Key Laboratory for Environment and Disaster Monitoring and Evaluation, Institute of Geodesy and Geophysics, Chinese Academy of Science, Wuhan 430077, China Department of Civil and Environmental Engineering, Lehigh University, Bethlehem 18015, USA)
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2017年第9期1476-1487,共12页
Resources and Environment in the Yangtze Basin
基金
长江科学院开放基金(CKWV2015236/KY)
国家自然科学基金(51479186)
湖北省青年科技晨光计划~~
关键词
丹江口大坝蓄水
变化范围法
水文特征指标
时空变化
生态效应
Danjiangkou reservoir impoundment
range of variability approach
indicators of hydrology alteration
temporal and spatial variation
ecological impacts
