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İzmir Katip Çelebi Üniversitesi (2021)

A geospatial planning and management system for Somalia’s local water resources (Shabelle River Hiiran Region)

OMAR Abdirahman Ahmed

Titre : A geospatial planning and management system for Somalia’s local water resources (Shabelle River Hiiran Region)

Somali yerel su kaynaklari için konum temelli bir planlama ve yönetim sistemi (Shabelle Nehri Hiiran Bölgesi)

Auteur : OMAR Abdirahman Ahmed

Université de soutenance : İzmir Katip Çelebi Üniversitesi

Grade : Doctor of Philosophy in Urban Regeneration Department 2021

Résumé
Somalia is a country located in the Horn of Africa with two perennial rivers, Juba and Shabelle. These two rivers can provide enough water for irrigation and other uses. Still, the lack of reliable data and an appropriate spatial management system has resulted in the misuse of these abundant resources. Limited water resources and tough competitions among various water demands create new challenges to the country’s economic development. However, water resource management has to articulate and combine the necessary resources which can preserve the ecological quality of the environment and society. People who live in arid and semi-arid countries like Somalia, where rainfall is highly variable and droughts or floods are unforeseeable are heavily impacted by water shortages and often have insecure livelihoods. The construction of water reservoirs such as earth dams near the Shabelle river to harvest rainwater from small watersheds and river runoff during high rainfall periods is one of the solutions available to overcome water shortages in Somalia in general and particularly in the Hiiran region. The success of rain water harvesting (RWH) systems depends heavily on their technical design and the identification of suitable sites. Our main goal is to identify suitable sites for dams using an appropriate multi-criteria decision analysis in ArcGIS 10.3.1. We have used various bio-physical factors : slope, stream flow, land use land cover, soil texture, soil erosion, and stream order ; however, to generate a thematic map, we used DEM with 5m resolution. The suitability map should be helpful to hydrologists, decision-makers, and planners to quickly identify areas with the highest potential for harvesting rain water. We have used geospatial technologies that promise to improve hydrological forecasting, land use land cover, and water resource management during this research. In this research, we used Erdas Imagine 2014 for image correction, water and vegetation analysis, and ArcGIS 10.3.1 to consolidate water-related data. The study is divided into six chapters ; however, chapters one, chapter two, and chapter three address a broad overview of the study area and the study’s background, while chapter four assess the Shabelle River’s regime flow and future water projects. In addition, chapter five describes multi-criteria decision analysis (MCDA) for the selection of suitable water storage sites in the Hiiran region, which employs a methodology based on four main steps ; criteria selection, classification of criteria, data analysis, and the generation of appropriate thematic maps for water storage site identification.

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Page publiée le 4 janvier 2023