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Watershed-wide trend analysis of temperature characteristics in Karun-Dez watershed, southwestern Iran |
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| Authors: | Safar Marofi Samere Soleymani Meysam Salarijazi Hossein Marofi |
| Institution: | 1. Department of Irrigation and Drainage, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran 2. Young Researchers Club, Islamic Azad University, Ahvaz Branch, Ahvaz, Iran 3. Department of Water Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran |
| Abstract: | Trend estimation of climatic characteristics for a watershed is required to determine developing compatible strategies related to design, development, and management of water resources. In this study, the trends of the annual maximum (T max), minimum (T min), and mean (T mean) air temperature; temperature anomaly (T anomaly); and diurnal temperature range (DTR) time series at 13 meteorological stations located in the Karun-Dez watershed were analyzed using the Mann–Kendall and linear regression trend tests. The pre-whitening method was used to eliminate the influence of serial correlation on the Mann–Kendall test. The result showed increasing trends in the T min, T mean, and T anomaly series at the majority of stations and decreasing trend in the T max and DTR series. A geographical analysis of the trends revealed a broad warming trend in most of the watershed, and the cooling trends were observed only in the southern parts. Furthermore, the geographical pattern of the trends in the T mean and T anomaly series was similar, and the T max data did not show any dominant trend for the whole watershed. This study provides temperature change scenarios that may be used for the design of future water resource projects in the watershed. |
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