Surface water infiltration test in the central plain of north China:A case study of Suolu River,Nangong
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Abstract:
Haihe River basin located in the north China plain,having serious threat of water shortage.To improve the current groundwater environment,the underground reservoir storage function should be fully utilized to use the groundwater funnel formed for many years by implementing the artificial and natural regulation and storage.In the central part of north China plain,soil properties are unfavorable to groundwater storage and surface water infiltration.A surface water infiltration test was carried out in the river belt to obtain the maximum underground storage space and provide a good strategy for the rational utilization of water resources. The infiltration test was carried out at Fanlu River,and the capacity of groundwater reservoir regulation and storage and the variation characteristics of groundwater level were studied by volume method and surface water infiltration test,which may provide a basis for water resource reserve planning in the Paleo-river area of north China plain.The experimental area of surface water infiltration was selected in the Nangong Gulu River,and monitoring data was obtained by artificial water diversion for 1.5 months,and the variation characteristics of groundwater level and water quantity and infiltration amount were studied. The results showed that the infiltration rate of the dry river reached 80.54%.The vertical seepage velocity of Ⅰ-Ⅰ′ and Ⅱ-Ⅱ′river section in the upper and lower reaches of the Suolu river was 10.81 m/d and 10.72 m/d,and the horizontal diffusion velocity was 1.69 m/h and 2.38 m/h.The vertical seepage velocity of Ⅰ-Ⅰ′ section was greater than that of Ⅱ-Ⅱ′section,and the horizontal diffusion velocity was less than that of Ⅱ-Ⅱ′,the water dome formed by Ⅰ-Ⅰ′section was more obvious than that of Ⅱ-Ⅱ′section,and it was not easy to dissipate.The calculation results showed that the storage capacity of the test area was 1.87×10.8 m3. Based on the analysis of groundwater level and water volume variation characteristics in the infiltration test of the Fanlu River,the following conclusions are drawn:(1)During the test,the penetration ratio was 80.54%.(2) Vertical permeation velocities at sections Ⅰ-Ⅰ′ and Ⅱ-Ⅱ′of the Fanlu River are 10.81 m/d and 10.72 m/d,which is related to the ratio of silt and silty clay in the aeration zone.The horizontal diffusion velocity of infiltrated water is 1.69 m/h and 2.38 m/h,which is related to the lithology of water level variation zone.(3)As the vertical penetration velocity of section Ⅰ-Ⅰ′ is greater than that of section Ⅱ-Ⅱ′and the horizontal diffusion velocity is lower than that of section Ⅱ-Ⅱ′,the formation of water dunes in section Ⅰ-Ⅰ′ is more obvious than that of section Ⅱ-Ⅱ′ and it is not easy to dissipate.(4) The change of water level in the monitoring hole is affected by both daily infiltration water volume and hydraulic gradient.The closer the monitoring hole to the infiltration field,the greater the influence of daily infiltration and hydraulic slope.(5) Groundwater reservoir total reservoir capacity is 3.21×10.8 m3,the storage capacity is 1.87×10.8 m3,and the empty storage capacity is 0.77×10.8 m3,respectively,which provides enough space for regional water resource storage.This study has a guiding significance for the selection of seepage site of Nangong groundwater reservoir and regional water resource regulation and storage and has certain reference significance for regional water resource regulation and storage through groundwater reservoir in north China.The deficiency of the research lies in the limitation of practical conditions,and the lack of monitoring holes of groundwater level has affected the integrity of groundwater dunes.It is suggested that the number of monitoring holes should be increased when conditions permit,to obtain more scientific test results.
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