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International Institute for Geo-Information Science and Earth Observation (ITC) 2003

Assessment of erosion and sediment yield processes, using remote sensing and GIS : a case study in Rose Chai sub catchment of Orumieh basin, West Azarbaijan, Iran

Najmoddini, N. (Nader)

Titre : Assessment of erosion and sediment yield processes, using remote sensing and GIS : a case study in Rose Chai sub catchment of Orumieh basin, West Azarbaijan, Iran.

Auteur : Najmoddini, N. (Nader)

Etablissement de soutenance : University of Twente International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2003

Résumé
Many watershed management decisions would be aided by an understanding of ongoing sediment production and erosion characteristics. In this thesis an assessment is made of the erosion and sediment yield in Rose chai subcatchment of the orumieh basin in northwest part of Iran. Efficient erosion analysis incorporates the following steps : collection of background information, interpretation of aerial photos, making data base, pr eparation of terrain mapping units, field work and analysis. The methodology also included GIS and remote sensing techniques. First part of study deals with the catchment’s sediment yield. Discharge and sediment concentration data were analyzed. These data have been recorded as instantaneous samples and were available for about ten years. The data were analyzed statistically and plotted against related moment discharges. Different regression lines were tried for prediction of sediment concentration from discharge data. The estimated average annual sediment yield is 349 ton/k 2 /y. In the second part of this study a generalized watershed erosion mapping is attempted using a modeling approach for the gross erosion, combing remote sensing, hydrologic analysis and field observation in a GIS environment, the USLE equation. Based on USLE equation .The result compared well with sediment yield.

Version intégrale (ITC)

Page publiée le 8 février 2018