LI B C，JIANG M M，ZHAO T F，ZHANG Y B，ZHAO S G，LAN Y，DU W B，YANG H M， WANG H，HOU J J，DAI Z Y. Study on the variation of ground water level around diversion channel under the influence of rainfall and soil property in subhumid zone[J]. Journal of Henan Polytechnic University( Natural Science), doi:10.16186/j.cnki.1673- 9787. 2024110032.

Received：2024-11-17

Revised：2025-02-27

Online：2025-08-08

Study on the variation of ground water level around diversion channel under the influence of rainfall and soil property in subhumid zone (Online)

Jiang Minmin¹， Zhao Tengfei ¹， Zhang Yibo ^2，3※， Zhao Shougang ^2，3， Lan Yan ^2，3，

Du Weibing ⁴， Yang Haoming ^2，3， Wang Hui ⁴， Hou Jiaojian ^2，3， Dai Zhiyu ^2，3

（1.College of Civil Engineering，Henan University of Technology，Zhengzhou 450001，Henan，China；2.Yellow River Water Conservancy Science Research Institute，Yellow River Water Conservancy Commission，Zhengzhou 450003，Henan，China；3.Engineering Technology Research Center for Dike Safety and Disease Prevention and Control，Ministry of Water Resources，Zhengzhou 450003，Henan，China；4. Henan Province Yangtze-to-Huaihe Water Diversion Project Co., Ltd.，Zhengzhou 450000，Henan，China）

Abstract: Objectives Groundwater leakage is prone to occur in the diversion channel of earth bed. Based on the demand for prevention and control of groundwater leakage in earth riverbed diversion channels, this study focused on the dynamic groundwater level response mechanism in semi humid monsoon climate zones, emphasize was put on reveal the influence of rainfall and soil property on variation of groundwater level around the diversion channel. Methods Through the field measurement of groundwater level in typical sections of Yangtze River to Huaihe River Diversion Project, the influence of rainfall intensity and duration characteristics and soil permeability characteristics on groundwater level, groundwater level change rate, and the relationship between the of groundwater level variation amplitude and rainfall are studied. Results We The result shows that: under the action of short-term heavy rainfall, the groundwater level show a sudden rise, and the peak rate of water level change lagged behind the peak rainfall by 1 to 3 days. The rising rate of groundwater level is obviously faster in the soil layer with larger permeability, up to 2116 mm/d. Under the action of long-term continuous light rain, the groundwater level rose slowly, and the change rate of the water level peaked on the day after the rain or one day after the rain. In the soil layer with larger permeability, the effect of groundwater flowing to the periphery was enhanced, and the peak value of groundwater level change rate is only 209 mm/d. Seasonal water level variation is affected by seasonal cumulative rainfall, also by rainfall characteristics and soil permeability characteristics. Short-term heavy rain is easy to cause seasonal mean water level to increase. Quantitative analysis show that the variation range of groundwater level increases exponentially with the increase of accumulated rainfall, and the index parameter is significantly affected by soil permeability characteristics. The index parameters of sand layer with strong permeability and silty clay and clay layer with weak permeability are 1.44 and 0.68, respectively. Conclusions The dynamic response mechanism of rainfall-soil strata-seepage was studied, and the research findings can offer theoretical grounds and technical support for the design and operation scheduling of leakage prevention and control in similar engineering environments for water diversion project.

Key words：Ground water level; Water level variation amplitude; Precipitation; Soil permeability

CLC: TV93