Application of geographic information system and SEDMODL to estimation of sediment and erosion in forest roads (case study: Kohian road, Lordegan city)
محمد نکوئی مهر
1
(
Soil Conservation and Watershed Management Research Department, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research and Education Centre, AREEO, Shahrekord, Iran.
)
Saleh Yousefi
2
(
Soil Conservation and Watershed Management Research Department, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research and Education Centre, AREEO, Shahrekord, Iran.
)
Sayed Naeim Emami
3
(
عضو هیأت علمی مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری
)
Keywords: Soil erosion, sediment production, road construction, access, Zagros,
Abstract :
In this study, the road sediment delivery model (SEDMODL) and geographic information system were used to estimate the amount and percentage of average annual sedimentation caused by the forest roads network in the oak forests in Chaharmahal and Bakhtiari provinces. In this research, Kohian forest roads located in Lordegan county with a length of 5828 meters was used as a study area. In this study, first, the required maps including geology, road networks, slope, rainfall and drainage density were prepared and digitized in the Arc GIS 10.8 software, and also during field visits, the type, age and traffic of the study roads were determined. By combining the maps prepared based on three basic factors in the model, the sediment caused by the study forest road network was calculated. Also, in this research, in order to measure the amount of erosion and sediment in the field, 48 erosion markers were installed in different parts of the study roads, and during one year, their changes were measured. The average soil erosion was estimated to be 3.6 mm in one year based on the measurements. According to the results, the erosion rate based on the SEDMODL on the Kohian road is 496 tons per year along the study road. Also, the amount of total sedimentation based on the SEDMODL in the roads of Kohian is 106 tons per year. In addition, the analysis of hot spots showed that 14.5% of Kohian forest roads have very high erosion production.
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