Groundwater-Surface Water Interaction Along the Main Course of Awash River; Integrated Approach
| dc.contributor.advisor | Kebede, Seifu (PhD) | |
| dc.contributor.author | Aregu, Tsedenya | |
| dc.date.accessioned | 2019-10-22T12:46:14Z | |
| dc.date.accessioned | 2023-11-09T14:10:54Z | |
| dc.date.available | 2019-10-22T12:46:14Z | |
| dc.date.available | 2023-11-09T14:10:54Z | |
| dc.date.issued | 2018-05-12 | |
| dc.description.abstract | In river basin hydrology the role of groundwater for being an integral part of the river basin water resources is often unrecognized. This is true in Ethiopia. Groundwater has multiple roles in river basins. It serves as source of water for socioeconomic activity, it maintains river flows during dry seasons and it could be the main pathway for solute and heat migration. In existing Awash Basin Master Plan groundwater is not accounted as one of the factor for increasing and imposing stress on existing surface water resources. There is increasing discussion among policymakers to learn more about the role of groundwater in the Awash Basin Hydrology. Through multiple methods, namely stable isotope of water (2H and 18O), isotope of Radon (222Rn), piezometeric evidences as well as field physico-chemical characteristics, investigation of groundwater surface water interaction along the main channel of Awash River has been carried out. The analysis of isotopic compositions of groundwaters from Upper Awash generally signifies, the groundwaters have similar isotopic composition to that of the present day rainfall. Whereas from middle and Lower Awash groundwaters here are mostly of older origin- because of lack of 14C data estimating the age of groundwater in the lower Awash Basin was not possible. From 222Rn measurements groundwater discharge into the river is observed, in Upper Awash, in the lower and middle Awash. There are some specific spots where groundwater discharge is noticed in the lower and middle Awash (e.g. around irrigation areas of-Wonji, Metahara and Amibara; and along thermal spring discharge zones downstream-e.g. Meteka). The Pizeometeric evidence also supports this observation. In which Upper Awash is generally a gaining river and the downstream river segments are generally loosing. Most of groundwater loss that occur in the lower part of Awash, takes place between Amibara and Mile and groundwater flows towards North Easterly direction and probably discharges into Lake Abe or into the sea or into other lower areas in Ethiopia. Evidences form various methods clearly indicate the presence of aquifer hydraulic link in the basin. This work generally showed that deep groundwater in the middle and Lower Awash can be considered as separate water resources, whereas, deep groundwaters in Upper Awash are hydraulically connected to Awash River. Therefore, areas where this interaction taking place is mapped based on the obtained results. This has a practical implication in finding way for water resource management, which can solve the current unbalanced usage of water resource. | en_US |
| dc.identifier.uri | http://10.90.10.223:4000/handle/123456789/19587 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Awash Basin | en_US |
| dc.subject | Groundwater-Surface Water Interaction | en_US |
| dc.subject | 222Rn | en_US |
| dc.subject | Stable Isotopes | en_US |
| dc.subject | Pizeometeric Evidence | en_US |
| dc.subject | Groundwater Management | en_US |
| dc.title | Groundwater-Surface Water Interaction Along the Main Course of Awash River; Integrated Approach | en_US |
| dc.type | Thesis | en_US |