Mapping of soil moisture by time domain reflectometry and electrical resistivity tomography at Velika Gorica well field, Zagreb aquifer

Pub Date : 2022-11-29 DOI:10.15233/gfz.2022.39.13
Laura Bačani, Kristijan Posavec, F. Šumanovac, Josipa Kapuralić
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Abstract

Knowing the soil moisture distribution in the unsaturated zone can improve understanding the water flow through the unsaturated zone and thereby enable the calculation of aquifer recharge, which occurs through precipitation. One part of the Zagreb aquifer recharge occurs through infiltration from precipitation. In order to observe and model infiltration from precipitation through the unsaturated zone, the research polygon was constructed at the Velika Gorica well field, located in the southern part of the Zagreb aquifer, Croatia, where hourly measurements of electric conductivity (EC) and soil moisture content were carried out. EC and soil moisture data are measured by Time Domain Reflectometry (TDR) probes which are placed at different depths in the unsaturated zone. Furthermore, electrical resistivity tomography (ERT) measurements were conducted. Geophysical data, along with moisture and EC data from TDR probes, were used as input data for MoisturEC software, in order to obtain soil moisture distribution along a 2D profile. MoisturEC program offers three options for translating EC data to moisture content data which are all tested in this research. We obtained eight moisture content distributions along the observed profile and concluded that MoisturEC provides reasonable results with input data from geophysical measurements and TDR probe measurements. Soil moisture distribution in the unsaturated zone represents the initial conditions for further unsaturated flow modeling. Understanding the flow in the unsaturated zone enables the quantification of effective infiltration and can improve groundwater management.
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在萨格勒布含水层Velika Gorica井田通过时域反射计和电阻率层析成像绘制土壤湿度图
了解非饱和带中的土壤水分分布可以提高对流经非饱和带的水流的理解,从而能够计算通过降水产生的含水层补给。萨格勒布含水层的一部分通过降水渗透进行补给。为了观察和模拟降水通过非饱和带的渗透,在克罗地亚萨格勒布含水层南部的Velika Gorica井场建造了研究多边形,在那里每小时测量电导率(EC)和土壤含水量。EC和土壤湿度数据通过时域反射仪(TDR)探头测量,该探头位于非饱和带的不同深度。此外,还进行了电阻率层析成像(ERT)测量。地球物理数据以及TDR探测器的湿度和EC数据被用作MoisturEC软件的输入数据,以获得沿2D剖面的土壤湿度分布。MoisturEC程序提供了三种将EC数据转换为水分含量数据的选项,所有这些都在本研究中进行了测试。我们获得了沿观测剖面的八个水分含量分布,并得出结论,MoisturEC通过地球物理测量和TDR探针测量的输入数据提供了合理的结果。非饱和区的土壤水分分布代表了进一步非饱和流建模的初始条件。了解非饱和带的流量可以量化有效渗透,并可以改善地下水管理。
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