Iran-Water Resources Research

Iran-Water Resources Research

Estimation of Runoff Coefficient in Karstic Area (A Case Study: Delibajak Sepidar, Kohgiluyeh and Boyer-Ahmad province)

Document Type : Original Article

Authors
R Porhemmat 1
H.R Nasseri 2
J Porhemmat 3
A Molaei 4
1 M. Sc. Graduate of Hydrogeology, Shahid Beheshti University, Tehran, Iran
2 Associate Professor, Faculty of Earth Science, Shahid Beheshti University, Tehran, Iran
3 Member of the Scientific Board of Agricultural Research, Education and Extension Organization, Tehran, Iran
4 -Member of the Scientific Board of Agricultural and Natural Research Center of Kohgiluyeh and Boyer-Ahmad Province, Yasooj, Iran
Abstract
Evaluation of infiltration and runoff in karstic areas is considerably important. These processes in karstic areas are more different from the other land coverages. Due to variation of factors affecting the infiltration and runoff in karstic areas, a specific formula cannot be set for these processes. In this study the amount of runoff and infiltration in a karstic catchment, named Delibajak in central Iran, were evaluated in both basin and plot scales. Precipitation and runoff components were continuously measured over the basin during research period and the runoff coefficient was estimated based on the collected data. Also, in plot scale, these components were evaluated on soil and rock coverages in 25 tests using sprinkler. Evaluated infiltration and runoff data in the basin-scale, show a very high infiltration capacity in Delibajak catchment, with very small runoff coefficients (1.5, 0.54 0.45 for events of 133, 130 and 95 millimeters of rain, respectively). Results of sprinkler data indicate a wide range of infiltration rate in Delibajak basin from almost zero to 40 percent.
Keywords
Karstic area
Infiltration
Precipitation
Runoff coefficient
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  • Receive Date 30 October 2010
  • Accept Date 07 October 2012