Study and recognition of erosion characteristics of perennial and ephemeral rivers in Tehran province
In the current study, at the first step, the hydrographic net of province rivers was provided based on topography map and hydrographic net from Tamab Company of Iran. Based on these definitions, the whole of Tehran province area was divided into 5 different areas. Based on these definitions, the whole of Tehran province area was divided into 25 different areas. In this study, the areas comprise 415 streams, and long in about 3038 part that 55.5% area had low sensitive to erosion, 49.82 % area had moderate to erosion and 44.63% area had highly sensitive to erosion. Based on the geological study (Alluvial- Stone), 64.72% of the area was categorized in alluvial class and 35.28% area was categorized in stone class. Based on sediments concentration, 26.61% area ranked in low concentration class, 17.05% area was ranked in moderate concentration class and finally, 57.34% area was ranked in high concentration class. Finally, it in view of bed- marginal erosion, about 63.9% were grouped in marginal erosion class and about 36.10% was grouped in bed erosion class.
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