摘要
为研究桂江流域中上游不同地质背景区的水沙特征及其水文动态对降雨的响应,选取集水区域以非岩溶区为主的桂林水文站和以岩溶区为主的恭城、荔浦、平乐水文站2010—2016年水文观测数据,以及2012年6月中游非岩溶区地表河流和岩溶区地下河流的两处水质自动监测点数据进行分析。结果表明:桂林站在发生降雨时的水沙变化较为平缓,地表河流水位、温度、pH、电导变化较小,而荔浦、恭城和平乐站以及地下河的水文动态变化剧烈,表现出暴涨暴落的特点;地下河温度、pH、电导变化较大,体现了地质背景对河流水文水化学动态变化的影响。站点水沙关系和土壤流失受到人类活动干扰的影响,各站点输沙量呈现不同程度的增加趋势,由于岩溶区地下漏失严重,荔浦河和恭城河增加趋势更明显,降低人为活动的干扰对流域生态和水土流失防治至关重要。
In order to understand the transport of sediment and the response of hydrological process to rainfall in the middle and upper reaches of Guijiang River,the flow discharge date and sediment flux data obtained from four monitoring stations(including Guilin,Gongcheng,Lipu and Pingle stations)from 2010 to 2016 were analyzed,and also the water quality data of two tributaries in the middle reaches in June 2012.The results show that the flow discharge and sediment flux at Guilin station changes slightly in response to rainfall process,and the changes in water level,temperature,pH and electrical conductivity of surface river are small.In contrast,large hydrological variations were observed at Lipu,Gongcheng,Pingle stations and the underground river,showing the characteristics of stormy rise and fall.And the temperature,pH and electrical conductivity change also greatly at the un⁃derground river.These reflected the influence of geological background on the dynamic changes of hydrology and hydrochemistry of rivers.The relationship between water and sediment and the loss of soil of rivers are affected by the disturbance of anthropogenic activities,and the sediment transport at each station shows an increasing trend in varying degrees.And the increasing trend of Lipu River and Gongcheng River is more obvious due to the serious underground leakage in the karst area.Therefore,reducing the disturbance of anthropogenic activities is crucial for watershed ecology and erosion control.
作者
韦小妹
黄芬
曹建华
代俊峰
WEI Xiaomei;HUANG Fen;CAO Jianhua;DAI Junfeng(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Key Laboratory of Karst Dynamics,MNR Guangxi,Institute of Karst Geology,CAGS,Guilin 541004,China;International Research Center on Karst,UNESCO,Guilin 541004,China)
出处
《水文》
CSCD
北大核心
2022年第6期61-67,共7页
Journal of China Hydrology
基金
国家自然科学基金资助项目(41772385)
国家重点研发计划资助项目(2021YFE0107100)
广西科技计划项目(2021AB28002,桂科AD17129047)
基本科研业务费项目(2020004)。
关键词
桂江流域
不同地质背景
水文站
降雨
水沙特征
Guijiang River
different geological background
hydrological station
precipitation
water and sediment characteristics
