时间：2022年6月9日（周四）下午4:00-4:45

Time: 4:00 pm-4:45 pm, Thursday, June 9, 2022

地点：云栖校区2号楼313会议室

Venue: Meeting Room 313, Building 2, Yunqi Campus

主持人：纳米光学材料实验室PI 彭斯颖

Host: Dr. Siying Peng, Nano-Optical Materials Laboratory

主讲人/Speaker：

武丽文博士

工学院生态环境研究实验室

主讲人简介/Biography:

武丽文，毕业于德国柏林洪堡大学获得自然科学博士学位。2021年4月加入西湖大学生态环境研究实验室。研究方向包括河流和地下水的交互机制，潜流带的物理化学生态过程，水文信息学，海岸带地下水动力学等。在前期工作中，她创新性地利用地球物理监测方法结合传统水文监测，以及多物理过程耦合数值模拟等方法揭示潜流带地表水与地下水的运动规律。其成果发表于Water Research Resources, Hydrology and Earth System Science等杂志。

Liwen Wu hold a doctoral degree of natural science (Dr.rer.nat) from Humboldt University of Berin in Germany. Her research interests include river groundwater interactions, biogeochemical processes in hyporheic zones, hydroinformatics, and coastal groundwater systems. She employs geophysical tools, conventional hydrological observation methods, and multicomponent numerical models to disentangle the interactions between surface water and groundwater. Her findings were published in journals including Water Research Resources, Hydrology and Earth System Science, etc.

讲座摘要/Abstract:

Interactions between rivers and their surrounding alluvial aquifers vary significantly over space and time, constraining the exchange of water, energy, and solutes, and therefore the biogeochemical transformations taking place within river sediments. Of particular interest is the effect of episodic and permanent disconnection of these two systems, a ubiquitous natural process that is being altered by anthropogenic stresses on water resources. This issue is particularly common in arid and semi-arid environments. In this talk I will first introduce the principles of groundwater surface water interactions, followed by various field observation tools and numerical simulation methods. As an example, we will focus on the implications of seasonal river-groundwater disconnection for hyporheic exchange. To this end, we use a multi-physics framework to model the evolution of the hyporheic zone and its biogeochemical potential as water table fluctuations lead to seasonal disconnection between the river and the alluvial aquifer. We explore transitions that mimic the compounding effects of climate variability and long-term pumping. Our results show that the river-groundwater disconnection acts as an additional process driving spatiotemporal dynamics in the hyporheic exchange processes. This dynamic behavior occurs even when the surface flow is steady state, which is common in arid and semi-arid regions during low-flow conditions. 

讲座联系人/Contact:

工学院葛琼颖

geqiongying@westlake.edu.cn