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Hydrological Drought Analysis of Karkheh River Basin in Iran using Variable Threshold Level Method

Mahshid Karimi1 * and Kaka Shahedi1

DOI: http://dx.doi.org/10.12944/CWE.8.3.11

Drought is an important phenomenon in recent years which caused a lot of problems for most of areas in Iran. Drought lead to water scarcity for people and this problem becomes one of the important challenges for the country. Karkheh River basin is one of the considerable water resources field in Iran and it is located in west parts of Iran. Current paper tries to take one step ahead toward scientific and practical drought management in Karkheh basin by analyzing hydrological drought. In this paper using daily discharge time series of 13 hydrometric stations which are located in the basin and also applying threshold level method, dry periods were extracted and results were analyzed. Results showed that the most volume and the most duration of drought in threshold level of 70% mostly happened within 1998-2000 and 2006-2008. Also the results of the frequency analysis of drought parameters indicted that for maximum deficit volume series Weibull distribution and Generalized Pareto Distribution (GP) in accordance with 77% of stations and for maximum duration series, GP distribution in accordance with 54% of stations had the most consistency. Based on this consistency, return period of droughts were also computed and the possibility of drought predictions in future was determined.

Hydrological Drought; Variable Threshold Level; Karkheh; Deficit Volume; Drought Duration

Copy the following to cite this article:

Karimi M, Shahedi K. Hydrological Drought Analysis of Karkheh River Basin in Iran using Variable Threshold Level Method. Curr World Environ 2013;8(3) DOI:http://dx.doi.org/10.12944/CWE.8.3.11

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Karimi M, Shahedi K. Hydrological Drought Analysis of Karkheh River Basin in Iran using Variable Threshold Level Method. Curr World Environ 2013;8(3). Available from: http://www.cwejournal.org/?p=5393

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Article Publishing History

Received: 2013-11-05
Accepted: 2013-12-17
 

Fig.1: The location of study area and hydrometric stations

Figure 1: The location of study area and
hydrometric stations 
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Table 1: Characteristics of selected
hydrometric stations in Karkheh River basin 
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Fig. 2: Number of drought events during study period in all stations

Figure 2: Number of drought events
during study period in all stations 
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Fig. 3: Deficit volume during study period for threshold level Q70 in all stations

Figure 3: Deficit volume during study period for
threshold level Q70 in all stations
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Fig. 4: Average deficit volume of hydrological drought in stations

Figure 4: Average deficit volume of
hydrological drought in stations 
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Fig. 5: Average drought duration of hydrological drought in stations

Figure 5: Average drought duration of
hydrological drought in stations  
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Table 2: The most suitable probability distributions of drought time series

Table 2: The most suitable probability distributions of drought time series

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Table 3: Return period of the most severe and longest drought events

Table 3: Return period of the most severe
and longest drought events 
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