Volume 23, Issue 4 (Special Issue of Flood and Soil Erosion, Winter 2019)                   JWSS 2019, 23(4): 299-313 | Back to browse issues page

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Soheili E, Malekinezhad H, Ekhtesasi M R. Spatial and Temporal Trend Analysis of Stream Flow in the Kor River and Drought in the Doroodzan Dam Basin. JWSS. 2019; 23 (4) :299-313
URL: http://jstnar.iut.ac.ir/article-1-3552-en.html
1. Department of Range land and Watershed Management, College of Agriculture and Natural Resources of Darab, Shiraz University, Shiraz, Iran. , es_sohaili@yahoo.com
Abstract:   (525 Views)
The Kor River in Fars province supplies an important part of water requirement in the Doroodzan dam basin and its surrounding area. In this study, the meteorological and hydrological droughts of this area were investigated in the last four decades. For this purpose, the temporal and spatial trend variability of the stream flow was investigated in monthly, seasonal, and annual time scales in the 6 selected stations. The trends of Standardized Precipitation Index SPI, as the drought index, in the 5 selected stations were also studied by the modified Mann-Kendall method. The results indicated that the trend in the stream flow was decreasing in all time scales. Significant downward trends were observed at 95% confidence level on monthly, annual and monthly time scales, especially in the warm months from May to September. These significant downward trends were located spatially in the stations located near the agriculture area, in the middle part of the basin. The significant upward trend existed only at the Doroodzan dam station, at the outlet in the area and in the warm months of the year. In the case of the SPI index, trends were  decreasing in all time scales and were  significant only at 2 stations in the long-term periods, 9, 12, and 18 months, at 95% confidence level. The results, therefore, indicated the occurrence of severe droughts (SPI<-2) during 1982-83 and 2007-8 periods.
Full-Text [PDF 1708 kb]   (71 Downloads)    
Type of Study: Research | Subject: Ggeneral
Received: 2017/08/4 | Accepted: 2019/01/23

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