خلاصة:
Evaluation of Sediment yield in watershed scale is considered so important for implementation of soil
conservation, watershed management, environment, dam construction and water resource management. Using
empirical model is one of the approaches of evaluating Sediment yield. This research in Kasilian watershed evaluates
Sediment yield by using Geomorphology method and EPM model with Arc View GIS soft ware. In Geomorphology
method four effective factors including slope, lithology, erosion faces and land use were used and information layers
were made by combining (over lay) them, then homogen unites were produced. Finally sediment yield were
evaluated in each one of them. EPM model which was used in Yugoslavia for the first time used four factors
including slope, lithology, landuse and erosion condition in each one of hydrological units and by using annual mean
of precipitation and temperature, also sediment ratio, evaluates sediment yield. After evaluation and comparison it
was found that the amount of sediment yield in Geomorphology method was 3.6% less (1197 ton/year) and EPM
model was 4.8 times more (5322 ton/year) than field observation, (1243 ton/year).
ملخص الجهاز:
Comparison of EPM and geomorphology methods for erosion and sediment yield assessment in Kasilian Watershed, Mazandaran Province, Iran L.
This research in Kasilian watershed evaluates Sediment yield by using Geomorphology method and EPM model with Arc View GIS soft ware.
In Geomorphology method four effective factors including slope, lithology, erosion faces and land use were used and information layers were made by combining (over lay) them, then homogen unites were produced.
EPM model which was used in Yugoslavia for the first time used four factors including slope, lithology, landuse and erosion condition in each one of hydrological units and by using annual mean of precipitation and temperature, also sediment ratio, evaluates sediment yield.
Keywords: Kasilian; EPM model; Geomorphology method; Erosion; Sediment yield 1.
Evaluating erosion and sediment yield with erosion potential model and Geomorphology method in Hydrology unites and Homogen unites, (both).
Results In present research after field observation information layers were produced in Arc view and Arc GIS: land use (Xa) litho logy (Y), slope (I) and erosion faces (φ) then we overlaid them and Z Factor obtained, (equation 1) in each Geomorphology and Hydrology unites.
Finally with using the other factors in every Homoge unite, (Geomorphology method) and sub – watershed, (EPM model) obtained and at last WSP, GSP and GS calculated.
The correlation between erosion potential categories derived from EPM model, and the erosion coefficients of rocks, topographical slope classes, and land use type we calculated in each Hydrology and Homogen unites.