ISSN 1000-3665 CN 11-2202/P
    王晓燕,李文鹏,安永会,等. 抽水试验中不同位置自动水位计响应数据应用分析[J]. 水文地质工程地质,2022,49(3): 57-64. DOI: 10.16030/j.cnki.issn.1000-3665.202202015
    引用本文: 王晓燕,李文鹏,安永会,等. 抽水试验中不同位置自动水位计响应数据应用分析[J]. 水文地质工程地质,2022,49(3): 57-64. DOI: 10.16030/j.cnki.issn.1000-3665.202202015
    WANG Xiaoyan, LI Wenpeng, AN Yonghui, et al. An analysis of the automatic water level monitors data at different positions in a pumping test[J]. Hydrogeology & Engineering Geology, 2022, 49(3): 57-64. DOI: 10.16030/j.cnki.issn.1000-3665.202202015
    Citation: WANG Xiaoyan, LI Wenpeng, AN Yonghui, et al. An analysis of the automatic water level monitors data at different positions in a pumping test[J]. Hydrogeology & Engineering Geology, 2022, 49(3): 57-64. DOI: 10.16030/j.cnki.issn.1000-3665.202202015

    抽水试验中不同位置自动水位计响应数据应用分析

    An analysis of the automatic water level monitors data at different positions in a pumping test

    • 摘要: 抽水试验中,动水位数据采集记录及处理分析对水文地质参数计算具有重要意义。近年来自动水位计被广泛用于抽水试验,通过传感器压强水头变化值获取水位降深。因井管内水流动会产生水头损失,自动水位计安放位置不同会导致获取的井水位降深不同,不同于传统方法测得的井水面降深,对水文地质参数计算将产生一定影响,因此如何合理放置自动水位计以及在参数计算中如何应用其获取的水位降深都亟待开展试验研究。在黑河流域第四系大厚度含水层地区,选择典型单层试验孔和利用分层封隔技术实现的一孔同径多层抽水孔开展试验研究,在动水位以下抽水试验层段上部、中部、下部以及潜水泵上部和下部分别放置自动水位计进行了系统的数据采集分析。结果表明:抽水试验中因井管内水流沿程水头损失及速度水头差异导致不同位置自动水位计获得压强水头变化值不同,本次试验实测到井筒内不同部位井损值;井损值在潜水泵进水口处最大,随距潜水泵距离的增大而减小,为避开井筒内较大水头损失对参数计算的影响,自动水位计宜优选安放在潜水泵上部接近动水位位置;在单孔抽水试验中利用稳定流公式计算水文地质参数时,自动水位计获取水位降深含井损不可忽略,需通过多落程抽水试验数据分析扣除后使用。同时,抽水试验中自动水位计不同位置获取数据的处理分析方法为更好地理解井中水头损失提供了依据。

       

      Abstract: In a pumping test, recording and analysis of the dynamic water level data are of great significance in the calculation of hydrogeological parameters. In recent years, automatic water level monitors have been widely used in pumping tests, and the pressure head change value of the pressure sensor is regarded as the drawdown of water level. Due to the water flowing in the well pipe can cause head loss, the automatic water level monitors at different positions can also obtain different drawdowns of water level, which are different from the drawdown of well water surface level measured by the traditional method and also has some influence on the calculation of hydrogeological parameters. Therefore, it is urgent to carry out experimental researches on how to place automatic water level monitors reasonably and how to apply the drawdown data from the automatic water level monitors in hydrogeological parameter calculation. In the large thickness aquifer area of Quaternary system in the Heihe River Basin, a typical single-layer test hole and a multi-layer test hole are selected for experimental studies, in which the multi-layer hole is a pumping test hole with the same diameter layered by the Parker technology. Under the dynamic water level, automatic water level monitors are placed in the upper, middle and lower parts of the pumping test section and the upper and lower parts of the pump for systematic data collection and analysis. The results show that in the pumping test, water flowing in the well pipe can cause head loss and velocity head difference, so the pressure head change value obtained by the automatic water level monitors at different positions are different. The well loss values at different parts of the wellbore are measured in this test. At the inlet of the submersible pump the well loss value is the largest, and decreases with the increasing distance from the submersible pump. To avoid the influence of bigger well loss on parameter calculation, the automatic water level monitors are preferably placed in the upper part of the pump close to the dynamic water level. When the steady flow formula is used to calculate the hydrogeological parameters in the single hole pumping test, the drawdown of the automatic water level monitor contains well loss, which cannot be ignored and needs to be deducted by the multiple drawdown pumping tests data. Moreover, the data analysis of the automatic water level monitors at different positions can provide a basis for better understanding the head loss in the well.

       

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