Trend Analysis of Ground-Water Levels and The Effect of Effective Soil Stress Change: The Case Study of Konya Closed Basin
Vahdettin Demir, Esra Uray, Osman Orhan, Amir Yavariabdi, Hüseyin Kusetoğulları
Abstract
Determining the change of the groundwater level, which is one of the hydrological cycle parameters, is very important for the planning, the management of water resources, and economic development. The parametric and the non-parametric trend analyzes are performed to designate the alteration of the hydrological parameters in time. This study focused on trend analyses of the monthly average water levels (mm) of 10 observation stations (181, 182, 8185, 9431, 9434, 10472, 13314, 17171, 52258, 52564) in Konya Closed Basin (between 1978-2020). The parametric Linear Trend method and the non-parametric Mann-Kendall method were utilized in the analyses. In the study carried out at 95% of the confidence interval, it was found that the groundwater levels at all stations showed a statistically decreasing trend, and this trend gradually increased in recent years. At the station where the difference between the maximum and the minimum groundwater level is most noticeable, the effect of change of the groundwater level on the effective earth pressure was investigated. It has been observed that the gradual change of groundwater level occurring in all months of the year between certain years affects the effective stress balance in the soil environment.