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Study role of geological formations and hydrological parameters on the based index, case study: Caspian area | ||
| مهندسی و مدیریت آبخیز | ||
| Article 3, Volume 5, Issue 2, August 2013, Pages 85-93 PDF (1.45 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijwmse.2013.101804 | ||
| Authors | ||
| Rahim Kazemi* 1; Ali Reza Eslami2 | ||
| 1Scientific Board, Soil Conservation and Watershed Management Research Institute, Iran, | ||
| 2Assistant Professor, Soil Conservation and Watershed Management Research Institute, Iran | ||
| Abstract | ||
| Base flow and related index is influenced by morphometric, geologic and hydroclimatological factors. As a result, it is precondition data for planning and water resources management. In this research, base flow and related index were extracted from daily stream flow data using one parameter recursive digital filter in eighteen hydrometric stations of the Caspian Basin. Physiographic, climatic, hydrological, and geological factors were calculated in GIS environment. Using factor analysis of the eighteen parameters, five factors were selected as independent factors. Statistical models were formulated to calculate several regressions between hydroclimatological and physiographic parameters. Further, residual analysis method was used to compare and evaluate the accuracy and efficiency of the models. Results showed that Hard Formations, the average height of basin, drainage density, and coverage of forest were the best predictors of the base flow index. Statistical models highlights importance of Q90/Q50 ratio as the suitable hydrologic index to estimate the base flow index. Besides, this model confirmed controlling role of Hard formations and the forest coverage on the base flow index. | ||
| Keywords | ||
| Base flow; Carbonate formation; Digital filters; Lithologic units; Regional models | ||
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