نتایج جستجو برای: gully erosion mapping using overlay index
تعداد نتایج: 3802357 فیلتر نتایج به سال:
Abstract Gully erosion affects the landscape and human life in many ways, including destruction of agricultural land infrastructures, altering hydraulic potential soils, as well water availability. Due to climate change, more areas are expected be affected by gully future, threatening especially low-income regions. In past decades, quantitative methods have been proposed simulate predict at dif...
there are technical and theoretical knowledge of the gully, ditch the clean areas on topographic maps and digital models that will help. however, the ability to use maps (dem) to identify the location and frequency of gully requires knowledge about the process of creating a moat.the present study modeled gulliation prone areas in dyreh river basin done. materials and methods used in this resear...
Taking the Quickbird optical satellite imagery of the small watershed of Beiyanzigou valley of Qixia city, Shandong province, as the study data, we proposed a new method by using a fused image of topography with remote sensing imagery (RSI) to achieve a high precision interpretation of gully edge lines. The technique first transformed remote sensing imagery into HSV color space from RGB color s...
The Piedmont region in the United States has been eroded and gullied due to deforestation and cultivation during the 1700 and 1800. Currently, a majority of these gullies are under forest vegetation and appear stable; however, neither the hydrology of these gullies, nor their sediment contribution to surface waters, has been quantified. This study instrumented eight gullies ranging in size from...
Motivated by the recent successful results of using GIS modeling in a variety of problems related to the geosciences, some knowledge-based methods were applied to a regional scale mapping of the mineral potential, special for Cu-Au mineralization in the Feyz-Abad area located in the NE of Iran. Mineral Prospectivity Mapping (MPM) is a multi-step process that ranks a promising target area for mo...
Purpose: to determine patterns of formation hydrographic network elements depending on the melt-and rainwater runoff and soil losses. Materials methods. The studies were carried out in upper reaches Bolshoy Log gully system, which is a part land use experimental farm “Polevoy” Federal Rostov Agrarian Research Center, with an area 2070 hectares, more than 70 % arable land. Soils are ordinary che...
The topographic threshold is based on the power relationship between area and slope widely applied in gully-erosion research; however, this requires further testing. Accordingly, Alamarvdasht Lamerd Fadagh Larestan regions Fars Province, Iran, were selected as case studies to explore for gullies. Thirty active gullies identified each study during field surveys, data describing land use cover, d...
Permanent gullies are a serious type of soil erosion. A special permanent gully, called “Benggang” severly affects agricultural production in hilly areas. To reveal the influence Benggang erosion on granitic restoration and fertility, we selected three stages (active, semi-stable stable) recovery subtropical granite region, corresponding samples were collected to analyze spatial variation physi...
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