Sensitivity Assessment for Soil Hydraulic Conductivity in a Coupled Surface-Subsurface Water Flow Model
For coupled surface-subsurface water flow modeling, the soil layer is an important domain since it affects both the generation of surface runoff and water flux between surface and groundwater flow. There is a need to assess how the soil physical parameters affect the modeling results to help guide field measurements and model parameter estimations. This paper investigates the sensitivity of the modeling results in response to the soil hydraulic conductivity by performing a surface-subsurface water flow simulation for a sub catchment of Lake Taihu. Results indicate that soil lateral flow and groundwater recharge are the most sensitive flow components to the change of soil hydraulic conductivity. An increase in soil hydraulic conductivity results in an increase in these flows. An increase in groundwater recharge consequently causes the rise of groundwater table for the catchment, which induces more groundwater discharge to rivers as base flow. It is worthy to note that a change of soil hydraulic conductivity less than 30% does not cause a noticeable change in flow components. It is also interesting to notice that the model prediction accuracy of river discharge is not sensitive to the change of soil hydraulic conductivity, which implies that assessment of simulation accuracy and model validation using river discharge solely may not be sufficient for a surfacesubsurface water flow simulation. Internal flow components are important and essential to use for a more reliable model validation.
Qi ZHANG
State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
国际会议
International Conference on Water Resources Management and Engineering(水资源管理与工程国际会议)
郑州
英文
75-78
2011-07-22（万方平台首次上网日期，不代表论文的发表时间）