Estimation of soil infiltration and groundwater recharge in Sukhuma District of Southern Laos
- Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada
- Publication Type:
- Conference Proceeding
- The 21st Congress of IAHR-APD, 2018, 2 pp. 773 - 781 (9)
- Issue Date:
This study is presented to estimate net soil infiltration and groundwater recharge in Sukhuma District of Southern Laos. A soil water balance approach is used to estimate the net infiltration from the Tropical Rainfall Measuring Mission (TRMM) and Global Land Data Assimilation System (GLDAS) data. The groundwater recharge is estimated by using the water table fluctuation method from observation groundwater levels at eleven domestic wells and five paired observation wells (shallow and deep). The results show that average annual net infiltration flux from 2000-01 to 2015-16 is decreasing at a rate of 6 mm/year. For the same period of the net infiltration flux, the average annual rainfall derived from TRMM for the Sukhuma District also depicts a declining trend with a rate of 26 mm/year. A value of specific yield for the shallow fractured sandstone aquifer in the Sukhuma District is quantified at approximately 0.03. Groundwater recharge for 2012-13 and 2015-16 is estimated at 5% (118 mm) and 4% (95 mm) of annual rainfall, respectively. The net infiltration estimated from GLDAS and TRMM data shows reasonable agreement with the ground-based measurements. The results of the current study provide useful basic information for future groundwater resource management planning in Sukhuma District. The methods applied in this study may be also useful for studying the soil infiltration and groundwater recharge in regions with limited field data.
Please use this identifier to cite or link to this item: