河床沉积物淤塞-冲刷影响下河水入渗带内铁锰生物地球化学过程研究

As the important zone and key interface during the interaction of surface water and groundwater,biochemical processes in the streambed sediments is of critical benefit to sustain the safety of water quality and ecology.Streambed sediments clogging and flushing will strongly changes the conditions of the river water infiltration and redox between the surface-groundwater interface,variations of nutrients flux ,which will make the biochemical processes during river water infiltration more complicated.To date,there is little information about how the streambed sediments clogging and flushing does control and affect the biogeochemical reations during river water infiltration.This proposal chooses Huangjia groundwater source area along the Liao river in Shenyang city as case study area,and selects iron and manganese sensitive to the variation of the acid-base and redox conditions as the target elements in order to interpret the biogeochemical processes of Fe and Mn during river water infiltration affected by streambed sediments clogging and flushing with multi-methods.The objectives of this proposal is to determine the temporal and spatial variation of river water infiltration intensity,nutrients flux and redox zoning affected by streambed sediments clogging and flushing,to interpret the biogeochemical processes of Fe and Mn during river water infiltration and its couping mechanism with hydraulics.We are believing that this research will scientically benefit to enrich the biogeochemical reactions in the exchange of surface water and groundwater and to protect the safety of groundwater supply.

作为地表水与地下水相互作用的重要地带和关键界面，河床沉积物内的生物地球化学作用对于维持水质和生态安全具有重要影响。河床沉积物淤塞与冲刷将会强烈改变河水入渗的水动力条件和河水-地下水界面氧化还原条件、营养物质通量，使得河水入渗过程中的地球化学过程更加复杂。针对目前对河床沉积物淤塞和冲刷如何控制和影响河水入渗生物地球化学作用的机制尚不完全清楚的现状，申请项目选择沈阳市辽河黄家傍河地下水水源地作为研究区，选择对氧化-还原条件和酸碱条件变化极为敏感的铁和锰为研究对象，采用多学科综合交叉研究技术和手段，分析河床沉积物淤塞-冲刷作用影响下河水入渗带水力交换强度、营养物质通量、氧化还原分带的时空演化规律，揭示河水入渗带内铁锰的生物地球化学过程及其与水动力过程的耦合机制。该项研究对于丰富地表水-地下水交互作用带生物地球化学研究内容，保障饮用地下水供水安全具有重要的科学意义。

作为地表水与地下水相互作用的重要地带和关键界面，河床沉积物内的生物地球化学作用对于维持水质和生态安全具有重要影响。河床沉积物淤塞与冲刷将会强烈改变河水入渗的水动力条件和河水-地下水界面氧化还原条件、营养物质通量，使得河水入渗过程中的地球化学过程更加复杂。针对目前对河床沉积物淤塞和冲刷如何控制和影响河水入渗生物地球化学作用的机制尚不完全清楚的现状，申请项目选择沈阳市辽河黄家傍河地下水水源地作为研究区，选择对氧化-还原条件和酸碱条件变化极为敏感的铁和锰为研究对象，采用多学科综合交叉研究技术和手段，分析了河床沉积物淤塞-冲刷作用影响下河水入渗带水力交换强度、营养物质通量、氧化还原分带的时空演化规律，揭示了河水入渗带内铁锰的生物地球化学过程及其与水动力过程的耦合机制。该项研究对于丰富地表水-地下水交互作用带生物地球化学研究内容，保障饮用地下水供水安全具有重要的科学意义。