Evaluation of the Impact of Land Use/Land Cover Changes on Flood Hazard and Risk Prone Areas Using Multicriteria Decision Making Techniques: The Case of Akaki Watershed, Ethiopia
| dc.contributor.advisor | Berhan, Gessesse (PhD) | |
| dc.contributor.author | Seid, Ali | |
| dc.date.accessioned | 2021-06-07T08:41:01Z | |
| dc.date.accessioned | 2023-11-28T13:46:15Z | |
| dc.date.available | 2021-06-07T08:41:01Z | |
| dc.date.available | 2023-11-28T13:46:15Z | |
| dc.date.issued | 2021-02 | |
| dc.description.abstract | The change in land use/land cover leads to a wide range of environmental impacts and degradation such as flooding, landslide, peak runoff, climate change, and loss of biodiversity around the world. The overall objective of the present study was evaluation of the impact of spatial and temporal variation of land use/land cover change on flood hazard and risk prone area of the Akaki Watershed using multicriteria decision making techniques. To achieve the objective of this study different flood hazard and risk causative factors were used such as elevation, slope, rainfall, drainage density, soil type, surface runoff and topographic wetness index (TWI) were integrated with different land use scenario in Analytical hierarchical process (AHP). Furthermore, the LULC change had been computed using post classification methods and the surface runoff also estimated using the SCS CN method for the three-land use scenario. As the result of the LULC revealed that urbanization was significantly increased. Consequently, the agricultural and forest-land was decreased, whereas the waterbodies were increased from 1988 to 2003 and then decreased from 2003 to 2018. Due to the expansion of built environment and the decline of forestland, the amount of surface runoff increased throughout the study period. in which the runoff increases in the LULC of 2003 from the LULC of 1988 by 17.27mm and the runoff increases in the LULC of 2018 from the LULC of 2003 by 24.85mm. Besides of this the flood hazard, risk and Vulnerability also increased throughout the study period in each land use scenario such as in the land use of 1988 the flood hazard level were estimated to 29.68, 274.53, 961.25 ,513.16, 8.92 km2 in the land use of 1988, 24.83,274.81, 915.62,562.63,9.65 km2 in the land use of 2003 and 17.12, 233.28, 698.21, 827.38, 11.56 km2.Which is subjected to Very low, low, moderate, high and very high respectively. and the flood risk also estimated to 481.68, 532.81 km2 which is subjected to high and very high, 786.83, 39.30 which is subjected to high and very high, and 40.87, 43.87 km2 also subjected to high to very high in the LULC of 1988, 2003 and 2018 respectively. The major findings of the present study revealed that the agricultural land and the built-up area were the most affected by flood hazard land-use class and the downstream of the present study was highly affected by flood hazard and near riverside and high populated areas of the watershed were faced with flood risk. To reduce the effect of flood hazard and risk proper land use management, afforestation, relocation of a house near riverside plays a significant role, specifically for the downstream or the low -lying flood hazard zone. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/26719 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Flood hazard | en_US |
| dc.subject | Flood risk | en_US |
| dc.subject | Vulnerability | en_US |
| dc.subject | LULC | en_US |
| dc.subject | Runoff | en_US |
| dc.subject | CN | en_US |
| dc.subject | Multicriteria analysis | en_US |
| dc.title | Evaluation of the Impact of Land Use/Land Cover Changes on Flood Hazard and Risk Prone Areas Using Multicriteria Decision Making Techniques: The Case of Akaki Watershed, Ethiopia | en_US |
| dc.type | Thesis | en_US |