Evaluating the Amount of Erosion and Sediment in Lavarefin Watershed (Hormozgan Province) By Using Remote sensing (RS), Geographic Information System (GIS), and Empirical Model (RUSLE)

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Abstract

 Increase
in wastage of soil resources in watershed is a persistent challenge that with
increase in population and pressure on natural sources and unstable plantation
on gradient farms and soils cause production reduces on farms, and also
decrease in daily ratio of farms to population can cause more pressure on lands
and natural resources.Lavarefin watershed placed in 60 km from Bandarabass in
Hormozgan province, and it's surface area is about 91.7334 hectare. Forecasting
soil erosion have always been a most common and prevalent method in natural
resource management to control soil's efficiency in watershed and estimating
the sediment amount and quality of water out of the watershed.   RUSLE model is a model of estimating the
amount of erosion in surface unit that corresponds to 6 erosion factors
including R, K , L, S, C, and P that respectively obtains from precipitation
data, map of region soil, digital elevation model and remote sensing.Survey the map of soil
erosion danger show that the amount of soil erosion is diverse in 0-7115
ton/hectare range per year. According to this map, high risk region for erosion
consist of regions in central part of watershed that the slop is high. The
average of yearly sediment in this watershed is estimated about 6.9
ton/hectare.The results of this study show that with compilation of RS, GIS and
using RUSLE model in agricultural regions, can estimate the soil erosion and
amount of Load sediment, and use these results for erosion management.  

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