:: Volume 19, Issue 66 (9-2019) ::
جغرافیایی 2019, 19(66): 139-163 Back to browse issues page
Evaluation of the impact of drainage network morphomety of The rate of sediment suspended yield (Case study: 15 basins in the North East of Iran)
Shahram Bahrami * 1, Ebrahim Taghavi moghadam2 , Mohammad Zanganeh asadi2
1- shahied beheshti
2- hakim sabzevari university
Abstract:   (5073 Views)

Awareness of sedimentation and erosion rates in catchment areas and effective factors. The most important concerns and challenges for geoscientists, especially geomorphologists. Morphometric parameters of drainage network have yery determinant role in the rate of sediment uield in catchment. In this research, in order to evaluate the correlation of morphometric indices of drainage network at annual sedimentation rate, a digital elevation model (DEM), digital topographic maps, geological maps, and statistics and information on the discharge of 15 drainage basins in northeastern Iran were used.And calculated the geomorphometric indices such as:  Drainage density (Dd), drainage frequency (FD), drainage (T), fault density (Df), length of drains (BL), branching ratio (Rb), number of hierarchical anomalies (Ha), hierarchical anomalous index (Δa ), The density of the hierarchical anomalies (Ga), concentration time (Tc) and erosion-sensitive units (E) for each of the basins were calculated in the software Arc GIS 10.5. The annual sedimentation rate was calculated using the Ciccacci  et al. 1987 method for each basin.The model was validated with sediment data (regional water organization) and the gauge-sediment curve.Then the Pearson correlation coefficient and the relationship of the mentioned indices were calculated using SPSS 17 software, with annual sedimentation rate in ton / km2. According to the results, the Tc, A, E, Ha, BL, Δa indices have a significant correlation with annual sedimentation rate of 0.274, 0.286, 0.118, 0.179 and 0.177 respectively, respectively.  There was no significant relationship in other indices.  The results of the research show that the method of Ciccacci et al. 1987 is not a suitable method for estimating annual sedimentation rates in research basins. And other factors have the greatest impact on the annual precipitation rate, precipitation intensity, soil condition and land use in annual sedimentation rates of these basins, which should be considered.

Keywords: Geomorphometry, catchment, suspended sediment annual yield
Full-Text [PDF 1395 kb]   (2450 Downloads)    
Type of Study: Research | Subject: Special
Received: 2017/07/29 | Accepted: 2018/01/28 | Published: 2019/09/1
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