%0 Journal Article
%A WU Qing-hua
%A WANG Gui-ling
%A ZHANG Jia-fa
%A ZHU Guo-sheng
%A ZHANG Wei
%T Numerical Modeling of Groundwater Recharge Based on SoilWater Infiltrating: A Case Study of Luancheng Area in Hebei Province
%D 2016
%R 10.11988/ckyyb.20150012
%J Journal of Yangtze River Scientific Research Institute
%P 16-21
%V 33
%N 4
%X In order to investigate groundwater recharge in a long-term scale, soil water volume content of a soil profile of 340cm depth was observed for five years in Luancheng test site of Chinese Academy of Sciences. The dual-permeability model (e.g., matrix region and marcopore region) of Hydrus-1D containing parameter optimization procedure was applied to simulate the soil water movement and groundwater recharge. The place at 140cm depth rather than on the soil surface was chosen as the upper boundary, which could overcome the complexity and uncertainty of datum on the soil surface. The  sensitivities of 17 parameters to  groundwater recharge in the Hydrus-1D were analyzed, and the results showed the sensitivities of soil water hydraulic parameters<i> n</i><sub>m</sub>,<i>n</i><sub>F</sub>,<i>α</i><sub>m</sub> and <i>α</i><sub>F</sub> (subscript <sub>m</sub> and <sub>F</sub> represents soil matrix and fracture regions, respectively) and saturated soil hydraulic conductivity K<sub>sF</sub> were the highest. These five parameters and other two parameters, i.e., <i>K</i><sub>a</sub> (effective hydraulic conductivity of fracture-matrix interface) and <i>w</i> (ratio of the volumes of the fracture domain and the total soil system) were chosen for the inversion. The modeling results showed that the modeled soil water volume content matched well to the measured values, with the correlation coefficient of 0.78. The groundwater recharge displayed similar character in each year of five years, e.g., the recharge was the largest in wet season, and then reduced gradually. The annual groundwater recharge was 220 mm/a, 211 mm/a of which attributed to the preferential flow, which indicated that the groundwater recharge was controlled by the preferential flow in this area. The results of this paper could be helpful to understand groundwater infiltration in a long-term scale, and could be useful to the management of groundwater resource and agricultural water saving.<br/><br/>
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20150012