Assessment of groundwater storage change and groundwater recharge using grace and gldas datasets in Cambodia | |
| Author | Sokneth Lim |
| Call Number | AIT Thesis no.WM-21-03 |
| Subject(s) | Groundwater--Cambodia Groundwater recharge--Cambodia GRACE (Artificial satellites) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | Groundwater along with surface water has been widely used across irrigation and domestic since ancient time in Cambodia. However, groundwater exploitation for the industry section is increasing. Decreasing in groundwater level has occurred in some part of the country. Monitoring and assessing groundwater storage change and groundwater recharge coupled with understanding the influence of drivers such as climate and land use factors on groundwater storage change is helpful for effective planning and management of groundwater resource in Cambodia; nevertheless, the information about groundwater in Cambodia is currently scarce. Thus, groundwater storage change in Cambodia over recent past 15 years from April 2002 to April 2017 was assessed using remote-sensing based Gravity Recovery and Climate Experiment (GRACE) and Global Land Data Assimilation System (GLDAS) datasets. The amount of groundwater recharge which has distributed to the aquifer in Cambodia over the period of 2003–2016 was also estimated. Furthermore, the impacts of climate and land cover variables on groundwater storage change were extensively analysed. Comprehensive validation of GRACE-derived groundwater storage anomaly with respect to in-situ field-based observations was also done. The validation results were promising as the correlation coefficient between satellite-based estimates and ground based measurements were up to 0.88. The depletion rate of groundwater storage change over the entire Cambodia was estimated to be 0.06 cm/month. Cambodia has been received average annual net recharge of 64 cm/year with average seasonal recharge of 28 cm and 36 cm for dry and wet seasons, respectively. Furthermore, it was found that the climate variables such as precipitation and evapotranspiration play a major role when compared to land cover variables on groundwater storage dynamics as the climate variables explain up to 50% in the groundwater storage change values. Apart from climatic and land cover variables, the impact of other factors such as human intervention in the groundwater storage change needs to be studied for better understanding and effective management of the groundwater systems in Cambodia. |
| Year | 2021 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Shanmugam, Mohana Sundaram |
| Examination Committee(s) | Babel, Mukand Singh;Shrestha, Sangam;Virdis, Salvatore G.P. |
| Scholarship Donor(s) | Loom Nam Khong Pijai (Greater Mekong Subregion) Scholarships |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2021 |