شبیهسازی پارامترهای اقلیمی بارش و دبی استان تهران تحت مدل CanESM2 (براساس تطبیق دوشاخص خشکسالی SPI و SSI) | ||
| پژوهشهای دانش زمین | ||
| مقاله 9، دوره 11، شماره 3 - شماره پیاپی 43، 1399، صفحه 149-166 اصل مقاله (1.25 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.52547/esrj.11.3.149 | ||
| نویسندگان | ||
| محمد حسین جهانگیر* ؛ سیده مهسا موسوی رینه؛ مهناز ابواقاسمی | ||
| گروه انرژیهای نو و محیط زیست، دانشکده علوم و فنون نوین، دانشگاه تهران، تهران، ایران | ||
| چکیده | ||
| بررسی خشکسالی به عنوان یکی از مخاطرات طبیعی، که زندگی اکثر مردم به آن گره خورده است، بسیار حائز اهمیت است. جهت آماده سازی در مقابله با خشکسالی و کاهش خسارات ناشی از آن از روشهای شبیهسازی، مدلسازی و تهیه مقدمات احتمال وقوع خشکسالی، استفاده میشود. در این مطالعه برای فراهم آوردن یک دید کلی از شرایط خشکسالی آینده از دو شاخص خشکسالی SSI و SPI استفاده گردید. در گام اول دادههای مربوط به دبی و بارش با استفاده از مدل CanESM2 تحت سناریو انتشار RCP4.5 و مدل ریزمقیاس SDSM برای دوره 2050-2020 پیشبینی شد سپس با توجه به موقعیت جغرافیایی هر ایستگاه مناسبترین تابع توزیع تجمعی برای هر شاخص در هر ایستگاه انتخاب گردید و امکان محاسبه شاخصهای خشکسالی SSI و SPI فراهم گردید. نتایج نشان داد در دوره آتی براساس شاخص SSI، ایستگاه شریفآباد بیشترین مقدار خشکسالی (74/2-) را داراست و همچنین براساس شاخص SPIبیشترین مقدار شاخص خشکسالی (17/2-) مربوط به ایستگاه لتیان است. لازم به ذکر است که تطابق دو شاخص در ایستگاههای نمرود و لتیان نیز با ترسیم متناظر منحنی تغییرات در طی دوره مطالعاتی نشان داد که اختلاف مقادیر عددی این دو کمیت، تنها برای 5 سال از انطباق مناسبی برخوردار نیست. | ||
| کلیدواژهها | ||
| پیشبینی خشکسالی؛ شاخص SPI و SSI؛ SDSM؛ استان تهران | ||
| عنوان مقاله [English] | ||
| Simulation of precipitation and water flow as climatic parameters in Tehran province under CanESM2 model (based on an adaptation of SPI and SSI drought indices) | ||
| نویسندگان [English] | ||
| Mohammad Hossein Jahangir؛ Seyedeh Mahsa Mousavi Reineh؛ Mahnaz Abolghasemi | ||
| Renewable Energies and Environment Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran | ||
| چکیده [English] | ||
| Introduction In the present study, to monitor droughts, the RCP4.5 scenario of the CanESM2 model of the Fifth IPCC Report and the most appropriate distribution functions of drought indicators were used to assess the current climate change and drought conditions in the present and future. Since the drought in an area can be affected by various climatic parameters, in this study, in addition to using SPI as a practical index, the important SSI index was also used to assess drought. Materials and Methods In the present study, the following steps were performed to monitor, evaluate, and inform the occurrence of droughts in Tehran province. 1. Quality control of precipitation and water flow parameters during the period 1986-2018 2. Prediction of these parameters during the period 2020-2050 based on daily output data of CanESM2 model under the RCP4.5 scenario using SDSM model 3.Selecting the most appropriate distribution function with time series for both SPI and SSI index 4.Drought detection and simulation using SPI and SSI drought characteristics during the next period (2050-2050). Results and Discussion The results of predicting the time series of precipitation and water flow using the DSM model In evaluating this model, two RMSE and MSE criteria were used, the results are given in Table 1 According to the results of Table 1, all eight stations had acceptable errors and it can be claimed that the SDSM model is more successful in predicting precipitation than Water flow. Selecting the most appropriate cumulative distribution functions Tables (2) and (3) show the ranking results of the studied functions for precipitation and forecasted data of meteorological and hydrometric stations. According to the results of Table 1, all eight stations had acceptable errors and it can be claimed that the SDSM model is more successful in predicting precipitation than Water flow. Selecting the most appropriate cumulative distribution functions Tables (2) and (3) show the ranking results of the studied functions for precipitation and forecasted data of meteorological and hydrometric stations. As shown in Table (2), at Mehrabad, Nimrud, and Ahar stations, the Fatigue life function was selected, and at the Latian station, the Wibble function was selected as the best cumulative distribution function. Using the Kolmogorov Smirnov test and according to the P-Value, Normal distribution function shows a better fit for Firoozkooh and Jajroud stations The Weibull function also shows the best fit for the Namrod station, and the Fatigue life function shows the most suitable fit for the Latin station. Matching SSI and SPI drought indicators for the next period The results show that due to the use of distribution functions, the drought situation has had similar results based on two indicators with two different quantities. This means that the use of proposed distribution functions has greatly reduced the percentage of predictive error Conclusion The results for future showed that Sharifabad station has the highest drought index (-2.74) based on SSI, and according to SPI, the highest drought index (-2.17) is for Latian station. It should be noted that the matching of the two indicators at Namroud and Latian stations was also studied and the results showed that the difference in the numerical values of these two quantities did not fit well for a 5 year period. | ||
| کلیدواژهها [English] | ||
| Drought forecast, SPI, and SDI index, SDSM, Tehran province | ||
| مراجع | ||
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