Influence of rainy season precipitation on groundwater level of Jingtoushan deep-buried earthen site in Zhejiang Province

doi:10.3785/j.issn.1008-973X.2022.03.019

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (3): 598-606, 612 DOI: 10.3785/j.issn.1008-973X.2022.03.019

Influence of rainy season precipitation on groundwater level of Jingtoushan deep-buried earthen site in Zhejiang Province

Xiao-wu TANG1,2(

),Min-liang FEI1,2,Yue YU1,2,Jia-xin LIANG1,2,Guo-ping SUN3

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou 310058, China
3. Zhejiang Institute of Cultural Relics and Archaeology, Hangzhou 310014, China

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Abstract

Taking the Jingtoushan site, the deepest and oldest typical coastal shell mound site on the coast of China, as an example, the groundwater level of the archaeological foundation pit during excavation from June 2018 to November 2020 was continuously monitored. The groundwater level of the foundation pit was predicted by the finite difference method. The feasibility of using the precipitation data in the past 5 to 30 years of 2018 and 2020 to predict groundwater levels was explored. The evolution pattern of groundwater level fields under different precipitation conditions was analyzed. The results show that the groundwater level is effectively simulated by the precipitation data in the past 5, 10, and 30 years of 2018 and 2020. The data of the past 30 years is the best precipitation boundary condition. The average relative error of precipitation data in recent 30 years is 5.73%, with 77.78% of the precipitation data not exceeding 10%. Persistent precipitation during plum rain and heavy rainfall during typhoons in the main rainy season tend to result in a high groundwater level predictive value, while in the dry season, the groundwater level predictive value is low. The groundwater level field in the foundation pit gradually evolved into a rectangular distribution in the late excavation period.

Key words： earthen site rainy season precipitation hydrogeological model groundwater level

Received: 12 April 2021 Published: 29 March 2022

CLC:

TU 46

Fund: 国家自然科学基金资助项目（51779218）

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	Xiao-wu TANG
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Cite this article:

Xiao-wu TANG,Min-liang FEI,Yue YU,Jia-xin LIANG,Guo-ping SUN. Influence of rainy season precipitation on groundwater level of Jingtoushan deep-buried earthen site in Zhejiang Province. Journal of ZheJiang University (Engineering Science), 2022, 56(3): 598-606, 612.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.03.019 OR https://www.zjujournals.com/eng/Y2022/V56/I3/598

雨季降水对浙江井头山深埋土遗址地下水位的影响

以中国沿海埋藏最深、年代最早的典型海岸贝丘遗址——井头山遗址为例，对2018年6月至2020年11月处于发掘阶段的考古基坑地下水位进行持续监测，通过有限差分法预测基坑地下水位，分别探讨基于2018年和2020年的近5~30年降水数据预测地下水位的可行性，分析在不同降水条件下地下水位场演化规律. 结果表明：基于2018年与2020年的近5、10、30年降水数据均可有效模拟地下水位，其中近30年降水数据为最佳降水边界条件，平均相对误差为5.73%，且有77.78%的数据平均相对误差不超过10%；主雨季期间梅雨季持续降水及台风强降水易造成地下水位预测值偏高，旱季造成地下水位预测值偏低；基坑内地下水位场在开挖后期逐步演化形成矩形分布.

关键词： 土遗址, 雨季降水, 水文地质模型, 地下水位

Fig.1 Meteorological elements of Yuyao city from 2018 to 2020

Fig.2 Geological profile of south sidewall of foundation pit at Jingtoushan site

Tab.1 Distribution and parameters of soil strata (No.ZK11)

Fig.3 Arial photography of study field at Jingtoushan site of late excavation (2020/10/30)

Fig.4 Layout of foundation pit at Jingtoushan site

Fig.5 Water level of observation well of study field and daily precipitation at Jingtoushan site

Fig.6 Finite difference grid of foundation pit in study field at Jingtoushan site

Fig.7 Boundary condition of foundation pit in study field at Jingtoushan site

Tab.2 Boundary condition parameters of foundation pit in study field at Jingtoushan site

Fig.8 Precipitation comparison of Yuyao city in last 30 years

Fig.9 Scatter plot of groundwater level proportional coefficient

Tab.3 Comparison of fitting accuracy of different precipitation sources

Fig.10 Evolution of seepage field at Jingtoushan site

Fig.11 Water level field after backfill at Jingtoushan site


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