Application of the risk monitoring drought of dryland products sub basically scale of sub basin on improvement of drought management (Case study: Khorramabad Basin)

Document Type : Research Article

Authors

1 Master of Science in Water Resources Engineering, Faculty of Water Engineering, Shahid Chamran University of Ahvaz

2 Professor of Hydrology and Water Resources, Faculty of Water Engineering, Shahid Chamran University of Ahvaz

3 Assistant Professor of Depth of Hydrology and Water Resources, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

4 Associate Professor, Department of Agricultural and Natural Resources, Lorestan University

Abstract

Drought risk management requires a strategy. Choosing a spatial scale is one of the strategic aspects. In the present study, drought monitoring was carried out at sub-basin scale and for dry lands products. For this purpose, using the SWAT simulator, the Khorramabad basin with a total area of 2480 km2 was divided into 31 sub-basins based on homogeneity of soil texture, land use and elevation. The RDI Drought Detection Index was calculated on a 9-month time scale for assessing agricultural drought during the period of 1348-1396, in accordance with the crop year. Using Thiessen method and the use of meteorological stations in the studied area, rainfall and temperature of each sub-basin, the estimation and relative reduction of yield of dryland products were calculated for each of the different drought intensities. The present study was able to compare the different areas of the basin with respect to the drought risk in different products. So that the risk of product production varies from 14 to 30 percent in each sub-basin. The average risk of producing dryland products including wheat, barley, peas and lentils was 21.2%, 18.8%, 17.4% and 18%, respectively. The results also showed that the effect of drought severity on the yield of each product is different. So, in the middle drought, 54-60, 47-55, 46-54, 47-57%, severe drought, 63-70, 58-64, 49-60, 51-62% and very severe drought, 75-82, 69-74, 59-68, 67-74%, reduced potential yield of each product, respectively, wheat, barley, peas and lentils respectively.

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Iranian journal of Ecohydrology
Volume 6, Issue 3
September 2019
Pages 767-779

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History

  • Receive Date: 10 January 2019
  • Revise Date: 21 May 2019
  • Accept Date: 21 May 2019
  • First Publish Date: 23 September 2019
  • Publish Date: 23 September 2019

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