The Variation of Water Infiltration Rate over Various Slopes in Taihang Mountain
ZHANG Zhihua;SANG Yuqiang;KONG Yuhua;FENG Xuejin;JIA Changrong;SHi Yuefeng;Forestry College of Henan Agriculture University;State-owned Nanshan Forest Farm in Jiyuan;Water Resources Protection and Research Institute,YRBWRPB;
【Objective】This study was to explore the variation of water infiltration over different slopes in Taihang Mountain.【Method】Representative slopes were selected in an abandoned land and two man-made forests with Quercus variabilis and Platycladus oriental plantation respectively. Based on field investigation and lab analysis, infiltration experiments were conducted at different location of the slopes. The Horton model, the Philip model and the Kostiakov model were used to simulate the infiltration processes.【Result】The initial infiltration rate, steady infiltration rate and average infiltration rate in the upper part of all slopes were the highest, followed by the middle and bottom parts. The steady infiltration rate in the upper slope with Quercus variabilis plantation increased 29.41% and 83.33%, compared to that in the middle and bottom parts of the slope respectively. For the slope with Platycladus oriental plantation these increases were 90.43% and 67.29% respectively, while for the slope in the abandoned land they were 20.00% and 36.63% respectively. The determination coefficient of the Horton model, Philip model and Kostiakov model was 0.90, 0.74 and 0.96, respectively.【Conclusion】Water infiltration over a slope varied considerably, with the rate on the upper part much higher than that on the middle and bottom. The Kostiakov model and the Horton infiltration model appeared to be more suitable for describing the water infiltration processes in the areas we studied.