华北东部平原深层抽水井水跃值计算方法及其规律研究

Calculation methods and characteristic analyses of deep well loss values in the eastern plain of northern China

文章分析了目前常用的几种水跃值计算方法的适用性与不足,认为在华北东部平原地下水位变化强烈的漏斗区,这些方法均难以应用。同时提出了C—G法,即一次定流量抽水同步观测抽水井和观测井的水位,合理地解决了区域背景水位对水跃值计算的影响。研究表明,与修正后的多次定流量试验法——两次定流量抽水法相比,C—G法计算结果可靠。然后探讨了如何间接获取抽水期间抽水层区域背景水位动态资料的方法,校正背景水位波动对抽水水位的影响,采用自动水位计(DIVER)同步监测井中大气压对地下水位的影响。最后分析水跃值随时间和抽水井水位降深的变化规律。

This paper discusses the applicability and disadvantage of methods for calculation of the well loss values, such as the direct method, s-lg r method, repeated steady flow pumping test method and mlti-drawdown-pumping test method. In the eastern plain of northern China, the area depression cone is huge and the change in groundwater level is obvious, making it difficult to calculate the well loss values by conventional methods. This paper presents a method, namely the C-G method, to address the issue. Compared with the modified repeated steady flow pumping test - double steady flow pumping, the result of the C-G method is more reliable. A method to correct the influence of the atmospheric pressure by a DIVER in the well and regional groundwater level variation on well loss values is introduced in this paper. The change in the well loss value with time and with groundwater level drawdown is also discussed.