Dynamic variation and hydrochemical characteristics of groundwater depth in Nansi lake west plain
Nansi lake west plain(Tengxi plain),located in the northwest of Zaozhuang city,Shandong province,is one of the"eight water sources"of Zaozhuang city.In this paper,the monitoring data of 41 groundwater monitoring wells in Tengxi plain from 2011 to 2020 were sorted and calculated,and the dynamic variation trend of groundwater depth and hydrochemical characteristics of Tengxi plain were analyzed.The results showed that the variation of groundwater depth in Tengxi plain was small in the year,generally ranging from 1 to 5 m.The annual variation of groundwater depth showed seasonal fluctuation.The groundwater depth began to increase from March to April in normal and dry years,which was mainly affected by agricultural irrigation.The groundwater depth was smaller in August and September in wet,normal and dry years,which was related to precipitation recharge.Combined with the dynamic method of water level,the groundwater level in Tenxi plain showed a rising trend in the past ten years,with an average rising rate of 0.41 m/a,and the area with the largest rise of groundwa-ter level was in the southwest of Tenxi plain.According to the analysis of Piper diagrams and Gibbs di-agram,the groundwater type in Tengxi plain was HCO3-·SO42--Ca2+,which was mainly affected by rock weathering.In order to provide some basis for groundwater management in Tengxi plain,this pa-per responds to the gradual attention of the state to groundwater in recent years.
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