A geographic information system and hydrophysical evaluation watershed analysis methodology: Ribeira da Boca Larga, Santiago Island, Republic of Cape Verde Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_projects/xd07gt52v

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  • The Cape Verde Islands, off the coast of West Africa, are subject to violent precipitation events that cause extensive soil erosion and degradation of the landscape. A systematic approach to the collection, analysis, and dissemination of hydrophysical and geographic data was needed to effectively analyze the cause and effect variables of landscape erosion at the watershed scale. A methodology incorporating geographic information system (GIS) analysis and modified stream reach inventory and channel stability evaluation techniques was developed for Ribeira da Boca Larga drainage on Santiago Island, Republic of Cape Verde. The stream reach inventory employed is a modified version of Pfankuch's "Stream Reach Inventory and Channel Stability Evaluation" (1975). Modifications were made due to the unique environmental conditions encountered in Cape Verde. The geographic information system runs on an IBM PC-AT compatible micro-computer and consists of three popular vector and raster geographic data storage and analysis software packages linked together by a fourth software bundle developed for custom communication and analysis of geographic data. Data from the stream reach inventory and geographic information system were combined to create uniform channel reach analyses and automated GIS products. These products are designed to assist the watershed manager, land use planner, and agricultural engineer in developing a concerted response to erosional phenomena in the evaluated drainage. The integrated stream reach inventory and geographic information system methodology was developed to serve as a model for watershed analysis throughout the Cape Verde Archipelago.
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