A GEOSPATIAL ASSESSMENT OF AREAS VULNERABLE TO FLOODING WITHIN SOKOTO RIMA RIVER BASIN IN SOKOTO STATE, NIGERIA
A GEOSPATIAL ASSESSMENT OF AREAS VULNERABLE TO FLOODING WITHIN SOKOTO RIMA RIVER BASIN IN SOKOTO STATE, NIGERIA
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Date
2018-10
Authors
BELLO, Abdulfatai Abiodun
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Abstract
Flood is one of the most harmful natural disasters in the world. Its effect on human existence as well as the environment has been on the increase due to human induced climate change. Farming activities, fishing, and human settlement are seen on the floodplain of the Sokoto Rima river basin. The study area is increasingly been threatened by flood event, and as a result of this, this research tries to identify the vulnerable areas, and the natural factors influencing flooding in the study area, with a view of providing solution to forestall its impact within the Sokoto Rima River Basin. Field survey, Satellite imagery, Global positioning system (GPS), Advanced Space-borneThermal Emission and Reflection Radiometer (ASTER GDEM), rainfall data and questionnaires administration were the materials and dataused. The research uses the AHP method, was used to carry out the pairwise comparison, and ArcGIS was used to analyze the data (elevation, slope, soil data, land use and land cover, drainage density and rainfall) as factor maps to determine which has more influence on the occurrence of flood. The results revealed that, rainfall has the greatest influence on flood occurrence in the study area with a weight of 34%. The results further showed that, 23.36% of the study area is in low vulnerable area, 34.59% of the study area is in moderately vulnerable area, while 42.05 of the study area is in highly vulnerable area. The flood hazard map showed that only one community (Lahodu) is within the very high risk zone. Based on population at risk, the result showed that only Gandi and Giyawa are the communities that are extremely vulnerable to flood with a population of 22182 and 15301 people respectively. On the effect of flood, farmlands suffers the greatest loss (61.25%) to flooding as reveals by the questionnaire. In view of the risk which the people in the area are exposed to, there is great need for settlements that are within or adjacent to the areas liable to flooding to be relocated and future settlements should be discouraged.
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY ZARIA, KADUNA STATE NIGERIA, IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF M.Sc. DEGREE IN REMOTE SENSING AND GIS DEPARTMENT OF GEOGRAPHY AND ENVIRONMENTAL MANAGEMENT, FACULTY OF PHYSICAL SCIENCES, AHMADU BELLO UNIVERSITY, ZARIA, KADUNA STATE
Keywords
GEOSPATIAL ASSESSMENT,, AREAS VULNERABLE,, FLOODING,, SOKOTO RIMA RIVER BASIN,, SOKOTO STATE,, NIGERIA