水科学进展2017，Vol.28Issue(2)：293-301,9.DOI:10.14042/j.cnki.32.1309.2017.02.015
水位变化影响下的河水-地下水侧向交互带地球化学动态
Influence of water level change on the geochemical dynamics of the lateralhyporheic zone between river water and groundwater
摘要
Abstract
Water level of the hyporheic zone essentially varies in different hydrological periods. In order to investigate the geochemical characteristics of the lateral hyporheic zone in different hydrological periods, Maanxi Creek in Chongqing was selected to be the study site. The water level, temperature, dissolved oxygen, pH, specific conduct-ance, and selected ions concentrations of the river water, lateral hyporheic zone, and groundwater were monitored during the transitional period of wet season to dry season ( October to December) . Results show that the water level of the lateral hyporheic zone was changed greatly with the arriving of dry season. The water level gradient decreased be-tween river and hyporheic zone, resulting in a reduction of infiltration from the river water. Because of change of water level and temperature drop of infiltrated water, the microbial activities in the lateral hyporheic zone declined, which increases pH and decreases dissolved oxygen. These changes also reduced the specific conductance and weakened the purification capacity of the lateral hyporheic zone to nitrate and sulfate, and enhanced the fixation capacity to the heavy metals, like manganese and zinc. Based on the analysis of the geochemical dynamics of the hyporheic zone, it can be deduced that the boundary of the hyporheic zone was shifted from a place of 30—50 cm in the wet season to a place of less than 30 cm away from the riverbank in the dry season.关键词
侧向交互带/水位变化/地球化学/马鞍溪/河水/地下水Key words
lateral hyporheic zone/water level change/geochemistry/Maanxi Creek/river water/groundwater分类
天文与地球科学引用本文复制引用
杨平恒,张宇,王建力,谢世友..水位变化影响下的河水-地下水侧向交互带地球化学动态[J].水科学进展,2017,28(2):293-301,9.基金项目
中央高校基本科研业务费专项资助项目(XDJK2014A016) （XDJK2014A016）
重庆市研究生科研创新项目(CYS16050)? The study is financially supported by the Fundamental Research Funds for the Central Universities (No. XDJK2014A016) . （CYS16050）
