Ali Akbar Jamali; Parvaneh Ashouri; Sedegheh Zarekia
Volume 17, Issue 1 , September 2010, , Pages 106-114
Abstract
Flood spreading will be more important and critical if drought occurred in arid and semi arid regions. Object is determination and prioritizing of flood spreading suitable sites for qanats, wells, and springs recharging in arid regions by using spatial multi criteria methods and GIS to combat with aridity ...
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Flood spreading will be more important and critical if drought occurred in arid and semi arid regions. Object is determination and prioritizing of flood spreading suitable sites for qanats, wells, and springs recharging in arid regions by using spatial multi criteria methods and GIS to combat with aridity and drought critic. Miankouh watershed in south of Yazd with 618 Km2 was selected as study area. In this study spatial economical factors such as proximity to road, qanat, well and spring were considered. Spatial natural factors and constraints such as vegetation cover density, geomorphology, land use and slope were interposed in the tree model. In spatial multi criteria evaluation method, factors were standardized through Boolean and fuzzy logics. Factor weights determined with ranking method. In next step with tree model and visual programming layers were combined in GIS environment that its result was composite index map (CIM) with fuzzy values. As a result, suitable region for flood spreading with values near to one were consisted areas with 15.02 km2 and all three priorities 2.43% of whole area in the watershed. This district had suitable common cover with region implemented flood spreading project. So, this method is recommended for determining suitable flood spreading sites in the same watershed areas.
Ali Akbar Jamali; Jamal Ghodousi; Mahdi Farahpour
Volume 14, Issue 2 , January 2007, , Pages 261-270
Abstract
Composing multi criteria and factors and do right decision making in rangelands for Biological soil Erosion Control is very complicate and strongly need to apply computer and spatial decision support systems. With these and experience a decision maker can show the best solution fast. Hable Roud ...
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Composing multi criteria and factors and do right decision making in rangelands for Biological soil Erosion Control is very complicate and strongly need to apply computer and spatial decision support systems. With these and experience a decision maker can show the best solution fast. Hable Roud watershed had many spatial data that provided by companies and organizations. Rangelands in this watershed were selected. A model for compositing the natural suitable spatial factors (sediment discharge, slope, rainfall, Range Factors: animal unit month, range trend, range condition), economic (proximity to road, proximity to villages, proximity to rivers, proximity to wells, proximity to spring) and constraints (slope, land use, village, roads, rivers, and rainfall shortage) was designed for suitable biological soil erosion control planning. Then they were standardized in value range between 0 & 1. they were weighted by analytical hierarchical processing (AHP). Of course some cases were weighted by direct method. Compositing of these layers were done by spatial multi criteria evaluation (SMCE). Output was composite index map. This map was classified by its histogram, and identified in each class which measure should be done. Biological soil erosion control plan was recommended (manure spreading, seeding with manure spreading, seedling and enclosure).