Author/Authors :
Ildoromi، Ali Reza نويسنده Department of Rangeland and Watershed Management Engineering, Malayer University, Malayer ,Iran , , Dashti Marvili، Maryam نويسنده Hamedan Branch, Islamic Azad University, Hamedan, Iran , , Zadbar، Ali نويسنده M.Sc. graduated,Department of Civil Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran , , Motevalli، Mostafa نويسنده M.Sc. graduated,Department of Civil Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran , , Dashti Marvili، Mohammad نويسنده Borujerd Branch, Islamic Azad University, Borujerd, Iran ,
Abstract :
Limited number of sediment stations and recorded data, as well as the inaccurate and insufficient sediment load analysis especially in dry and semi- dry areas have caused several problems in modeling of sediment discharge. Accordingly the regional analysis seems to be a useful and appropriate model in estimation of sediment loads. In this study the model results are compared with sediment load estimation in Ghareh chay watershed, located in western Iran in an area of 221.55 km2. For 9 sub-basins with 20 years of compatible data records, the average annual suspended sediments and morphometrical factors were used respectively as predicting variables. The regression models were then applied in order to reach the goals of the research. Among the results obtained through applying bivariate regression, the elongation index, channel density, drainage density and average gradient were found important. Similarly, the length, area and perimeter of the main channel as well as Horton coefficient were found as determining factors through multiple regressions. The results revealed that the study can be utilized by decision makers and managers to an appropriate management of Ghareh chay watershed in order to reduce sediment problems.
