MAPPING SOIL EROSION RISK IN ZILIBARCHAY CATCHMENT: USING MICROLEIS, GIS & REMOTE SENSING

Publish Year: 1392
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

ICEHH02_797

تاریخ نمایه سازی: 13 آبان 1393

Abstract:

In this article, a raster geographical information system (GIS) combined with an expert evaluation system.Then they were used to assess soil erosion in the Zilibarchay catchment in Azarbaijan sharghi provenance, - North West of Iran, where changes in land use were quite rapid at the beginning of the last decade. A soil survey was carried out in the Zilibarchay catchment to identify the soil types and to determine physico-chemical properties related to soil erodibility. A grid pattern was established across the studyarea and 70 sites were sampled. The GIS was used to integrate the information derived from an automated land evaluation system that, in turn, identified the erosion risk of areas by combining data on various soil properties and physiographic and bioclimatic factors. Satellite imagery is used to reach rapidly to the actual land use classification. According to the map of erosion risks generated for the catchment and the sampling analysis the soils on the shrub slope part was smallest and significantly different from the deeper and better developed soils on the north and south slope, indicating different patterns of soil mobilization. The relationship of some basic soil properties was also examined, such as organic matter and texture, in terms of the patterns of radioisotope distribution and soil erosion. In the catchment, soil redistribution was affected by physiographic and landscape features such as soil properties, slope gradient as well as orientation and vegetation cover. Soil loss was highest along the shrub transect where the rate of soil erosion was much higher than soil formation. Conversely, the soils on the forest transect were mainly stable although some sediment was also deposited. Both aggradations and erosion were found in the valley bottom and some part in the north east. The automated evaluation system and GIS used to identify areas vulnerable to erosion combined with the sampling technique and Morgan method have proven to be a suitable approach to assess soil erosion aimed to design effective strategies for soil conservation in Zilibarchay catchment.

Authors

Mehdi Abdullahi

university of Tabriz, Fatculity of Humanities and Social Science

Farzaneh Shams

University of Tabriz, Faculity of Natural Sciences, Department of Geology

Parviz Ghazanfari

Imam Khomeini International University of Science, Department of Geology

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