نوع مقاله : مقالات پژوهشی
نویسندگان
1 دانشگاه فردوسی مشهد، دانشکده کشاورزی، گروه علوم و مهندسی آب
2 دانشیار گروه آموزشی علوم و مهندسی آب-دانشکده کشاورزی دانشگاه فردوسی مشهد
چکیده
بارش یکی از مهمترین پارامترهای ورودی در مدلهای هیدرولوژیکی جهت شبیهسازی بارش-رواناب میباشد که به علت عدم پراکندگی مناسب ایستگاههای بارانسنجی و تازه تأسیس بودن برخی از این ایستگاهها در اکثر حوضههای کشور، استفاده از این دادههای بارش با چالشی جدی روبروست. از این رو استفاده از روشهای سنجش از دوری میتواند یکی از گزینههای مورد استفاده در زمینه شبیهسازی جریان با استفاده از مدلهای هیدرولوژیکی باشد. در پژوهش حاضر، دادههای بارش بازتحلیلشده ERA5 برای حوضه آبریز کشفرود در گامهای زمانی روزانه و ماهانه مورد ارزیابی قرار گرفت و سپس با استفاده از دادههای بارش ایستگاه زشک و پارامترهای مربوط به حوضه آبخیز زشک در نرمافزار HEC-HMS، هیدروگراف جریان آن مورد بررسی قرار گرفت. نتایج نشان داد که دادههای بارش ERA5 در گامهای زمانی روزانه و ماهانه دارای کمبرآوردی میباشند و نیز در گام زمانی ماهانه دقت این دادههای بارش در تشخیص وقایع بارشی (از نظر شاخصهای FAR، TS و POD) بالاتر از گام زمانی روزانه بود. همچنین دادههای بارش بازتحلیلشده ERA5 در گام زمانی ماهانه، در ماههای گرم تابستان دقت پایینتری در تشخیص وقایع بارش نسبت به بقیه ماههای سال داشتند. هیدروگراف جریان حاصل از دادههای بارش بازتحلیل شده ERA5 نسبت به هیدروگراف مشاهداتی دارای کمبرآوردی بود که علت آن کمبرآورد کردن میزان بارش در موقعیت ایستگاه زشک در محدوده روزهای متناظر با واقعه 23/1/99 توسط ERA5 بود. همچنین هیدروگراف یادشده در مقایسه با هیدروگراف مشاهداتی در محدوده غیر قابل قبول (NSE≤0.5 و PBias≤±25) بود. به طور کلی دقت هیدروگراف جریان حاصل از این محصول نسبت به هیدروگراف جریان حاصل از دادههای بارش ایستگاه زشک، نمیتواند منبع مورد اعتمادی در مدلسازی هیدرولوژیکی باشد.
کلیدواژهها
موضوعات
عنوان مقاله [English]
Evaluation of Streamflow Hydrograph using ERA5 Precipitation Data in HEC-HMS Model
نویسندگان [English]
- S. Pourentezari 1
- K. Esmaili 1
- A.R. Faridhosseini 2
- E. Ghafari 1
1 Ferdowsi University of Mashhad, Faculty of Agriculture, Department of Water Science and Engineering
2 Ferdowsi University of Mashhad, Faculty of Agriculture, Department of Water Science and Engineering
چکیده [English]
Introduction
Precipitation is one of the most important input parameters of the hydrological models for rainfall-runoff simulation, which due to the lack of proper dispersion of rain gauge stations and the newly established some of these stations in most basins of the country, the use of these precipitation data faces serious challenges. Therefore, the use of remote-sensing methods is one of the ways that can be used for the streamflow simulation using hydrological models. Runoff is also one of the most important hydrological variables and rainfall-runoff modeling is one of the key items in hydrological sciences to estimate runoff characteristics such as volume, peak flow and arrival time to peak flow. In the present study, we used reanalyzed precipitation data and then evaluated the simulated streamflow using this precipitation data in the Zoshk subbasin. The precipitation data was validated with in situ data, of Kashafrood basin.
Materials and Methods
The reanalysis precipitation data was selected from the ERA5 precipitation data, and the HEC-HMS was used for the rainfall-runoff simulation. The basin parameters were calculated by the GIS menu. This menu is the newest option in the HEC-HMS software that needs only the DEM basin for calculating the basin parameters. In the present study, we should validate the ERA5 reanalysis precipitation data with in situ data, so we did that in the Kashafrood basin. The number of the rain gauge stations were 34, but some of the stations didn't have complete data and omitted them from the list of the rain gauge stations. For the validation ERA5 reanalysis precipitation data was used from the R, NSE, RMSE, Bias, FAR, POD and TS statistical indicators. These indicators were calculated by programming in EXCEL Visual Basic. The ERA5 precipitation data was evaluated for the Kashfarood basin at daily and monthly time steps. The DEM Zoshk was downloaded with the spatial resolution of 12.5 meters from ALOS-PALSAR satellite and then the basin parameters were calculated by the GIS menu. The SCS curve number was selected as a loss method. In this method, the calculations related to the percentage of impermeability and the average curve number of each sub-basin were obtained through land use and curve number layers, respectively. The SCS unit hydrograph was selected as a transform method. The recession method was selected as a base flow method. NSE and PBias were used for the calibration and validation events in HEC-HMS. In this way, at first the HEC-HMS model was calibrated by tow in situ rainfall-runoff events (91/1/11 and 91/2/6), and then validated by one in situ rainfall-runoff event (99/1/23). For validation streamflow of the ERA5 reanalysis precipitation data, the event on 99/1/23 was used and their streamflow hydrographs were evaluated with each other in Zoshk station.
Results and Discussion
The results showed that the reanalysis precipitation data of ERA5 had underestimation in daily and monthly time steps. Also in monthly time step, the accuracy of these precipitation dataset in detecting precipitation events (in terms of FAR, TS, and POD indices) was higher than a daily one. In addition, in monthly time steps it had worse accuracy in summer months than the rest of the year in detecting precipitation events (in terms of FAR, TS, and POD indices). For streamflow evaluation, in the calibration phase both NSE was in very good and good ranges, and PBias was in very good, good and acceptable ranges. In addition, the model underestimated the observational one. Finally the ERA5 reanalysis precipitation data was compared by 99/1/23 hydrograph event. The streamflow hydrograph from the ERA5 reanalysis precipitation data was underestimated due to ERA5 underestimation of the precipitation at the Zoshk rain gauge on the days corresponding to the 23/6/99 incident. The ERA5 reanalyzed precipitation data with NSE and Bias percentage coefficients in unacceptable range (NSE≤0.5 and PBias≤±25), compared to flow hydrograph obtained from Zoshk station precipitation data, the efficiency of this precipitation dataset is low. The range of the streamflow hydrograph from the ERA5 precipitation data was unsatisfactory in compared to the observational hydrograph (NSE = -0.47 and PBias = -55.16).
Conclusion
In general, the accuracy of the flow hydrograph of this product compared to the flow hydrograph of the precipitation data of Zoshk station (NSE = 0.64 and PBias = -15.82), cannot be a relatively reliable source instead of in situ rainfall data in hydrological simulation. The suggestion for future studies is to evaluate other rainfall data based on remote sensing methods in hydrological modeling.
کلیدواژهها [English]
- ERA5
- GIS Menu
- HEC-HMS
- Streamflow hydrograph estimation
- Zoshk river
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