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شبیهسازی رواناب و بار رسوب حوزه آبخیز رودخانه هراز مازندران با بهرهگیری از الگوی SWAT | ||
پژوهش های جغرافیای طبیعی | ||
مقاله 3، دوره 47، شماره 2، تیر 1394، صفحه 197-211 اصل مقاله (839.55 K) | ||
نوع مقاله: مقاله کامل | ||
شناسه دیجیتال (DOI): 10.22059/jphgr.2015.54459 | ||
نویسندگان | ||
عطاالله کاویان1؛ محمد گلشن* 2؛ حامد روحانی3؛ اباذر اسمعلی عوری4 | ||
1دانشیار دانشکدة منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
2دانشجوی دکتری آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
3استادیار دانشکدة منابع طبیعی، دانشگاه گنبد کاووس | ||
4دانشیار دانشکدة منابع طبیعی، دانشگاه محقق اردبیلی | ||
چکیده | ||
با توجه به احداث سد در خروجی حوضة آبخیز هراز با مساحت 401 هزار و 927 هکتار، شبیهسازی رواناب و رسوب حاصل از بارش حایز اهمیت است. برای این منظور، از الگوی SWAT استفاده شد. واسنجی الگو بهمنظور شبیهسازی رواناب برای سالهای 1995 تا 2004 انجام گرفت و با استفاده از نمایههای آماریR2، NS و MSE ارزیابی شد. نتایج نشان داد مقادیر آمارهها بهترتیب در ایستگاههای کرهسنگ 80/0، 77/0 و 93/20، چلاو 75/0، 73/0 و23/1، رزن 79/0، 75/0 و 91/5 و پنجاب 68/0، 55/0 و 7/2 بود. همچنین، واسنجی رسوب در ایستگاه کرهسنگ برای سالهای 2002 تا 2006 صورت گرفت و بهترتیب مقادیر آمارهها 61/0، 60/0 و 60 هزار تن بهدست آمد. بهمنظور اعتبارسنجی نتایج، این الگو برای سالهای 2005 تا 2009 اجرا شد. مقادیر ضرایب آماریR2،NS و MSE بهترتیب در ایستگاههای کرهسنگ 87/0، 75/0 و 17/10، چلاو 83/0، 77/0 و 21/0، رزن 81/0، 72/0 و 34/1 و پنجاب 75/0، 70/0 و 67/0 بود. برای اعتبارسنجی بار رسوب نیز از آمار سالهای 2007 و 2008 استفاده شد که بهترتیب مقادیر 68/0، 53/0 و 136 هزار تن بهدست آمد. نتایج نشاندهندة زیاد بودن دقت شبیهسازی دبی جریان بهترتیب در ایستگاههای کرهسنگ، رزن، پنجاب و چلاو است. | ||
کلیدواژهها | ||
الگوی SWAT؛ حوضة هراز؛ رسوب؛ رواناب؛ SUFI2 | ||
عنوان مقاله [English] | ||
Simulation of Runoff and Sediment Yield in Haraz River Basin in Mazandaran Using SWAT Model | ||
نویسندگان [English] | ||
Ataollah Kavian1؛ Mohammad Golshan2؛ Hamed Rouhani3؛ Abazar Esmali Ouri4 | ||
1Associate Professor of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran | ||
2PhD Candidate, Watershed Management, Sari Agricultural Sciences and Natural Resources University, Sari, Iran | ||
3Assistant Professor of Natural Resources, University of Gonbad Kavous, Iran | ||
4Associate Professor of Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran | ||
چکیده [English] | ||
Introduction Simulations of river flow and understanding different components of hydrologic cycle are important for programming of the conservation aspects of water resources. Since the study area is located in the site of dam construction, the estimation of rainfall runoff and sediment yield are very important for better management of water resources. Therefore, in this study, the SWAT model was applied. SWAT model is one of the multipurpose simulation models for management of watershed. The main objective of hydrologic models is simulation and prediction of the behavior of the catchment basin. Hydrologic models can simulate land surface hydrological processes to improve water resources management. Today, GIS tools are commonly used in natural resource management; especially in watersheds with several banks. They have linked information such as digital maps. GIS is designed and developed to predict the results of spatial management activities. For situation awareness systems, we need to add the elements of system dynamics. SWAT model is an advanced communication window possible to combine a set of models and GIS data in groundwater and surface water flows and floods. Materials and Methods The study area of this research is located between 539,022 to 622,236 Eastern longitude and 3,923,033 to 4,009,208 north latitude in zone 39 of UTM. Haraz watershed with an area of 401927.2 hectares is located to the south of the province and in the vicinity of Amol City. The minimum height of 300 meters and a maximum height of 5600 meters are the elevation limits. Calculation of runoff in SWAT model can be simulated in two ways: Green Ampt and SCS curve. SWAT model to simulate the hydrological cycle on the water balance equation is as: Prediction of the rate of soil erosion caused by rainfall and runoff in SWAT model is based on equation MUSLE. In this method, surface runoff is used as an agent of erosion. Sediment transport lag in the effect of snow cover on erosion, sediment and lateral flow of groundwater is also calculated. In order to improve the quality of model calibration and uncertainty analysis in SWAT-CAP software sufi2 method was used. SUFI2 program combines calibration uncertainty and tries to determine parameter uncertainty, so that most of the observed data in the region of uncertainty can be determined. Results and Discussion Using ARC- SWAT software watershed study area was divided into 25 sub basins. Because of the diversity of land use map and soil the sub basins were divided into 91 hydrologic units (HRU). In the following calibration and validation, during the first stage 20 variables were selected and the initial values are based on a list prepared by the guide table of SWAT, the application entered SWAT CUP. After 600 iterations, each algorithm of SUFI2 determined 8 parameters for simulation of runoff and sediment load parameter 5 as sensitive agents. Then, the model was calibrated to simulate runoff for years of 1995-2004, and evaluated using correlation coefficient (R2), coefficient of Nash – Sutcliffe (NS) and Mean of Squared Error (MSE). The results showed that the values of the coefficients R2, NS, and MSE in the Karehsang station are 0.80, 0.77, and 20.93, in Chelav Station are 0.75, 0.73, and 1.23; in Razan Station is 0.79, 0.75, and 5.91 and in Panjab station are 0.68, 0.55, and 2.70, respectively. Sediment yield was also calibrated in Karehsang station for the years of 2002-2006 and the statistical coefficients of (R2) and NS were obtained 61 and 60 percent, respectively. To perform validation, the model was run for years of 2005-2009. The results showed that the coefficients of R2, NS, and MSE are 0.87, 0.75, and 10.17 for Karehsang station; 0.83, 0.77, 0.21 for Chelav station; 0.81, 0.72, 1.34 for Razan station, and 0.75, 0.70, 0.67 for Panjab stations, respectively. Validation of sediment yield was done for the years of 2007-2008 with coefficients of NS and R2 equal to 53 and 68 percent. Conclusion The primary objective of this study was to evaluate the performance of SWAT model to simulate runoff and sediment yield of Haraz watershed gauging stations within the basin. In the sensitivity analysis, the various parameters for runoff curve number (CN), Soil Density (SOL-BD) and hydraulic conductivity effects (CH-K2) are of high sensitivity. The high sensitivity of the CN parameter is investigated in the domain of the role of environmental factors and land use in runoff areas. The results of the study are consistent with the results of the studies of Panagopoulos and colleagues (2011) and Parajuli et al. (2013). To predict sediment parameters for the simulation of sediment load, SPCON, SPEXP and SOL_AWC are more sensitive to be considered. According to the figures, the values of peak runoff and soil loss estimates are close to the observed values. Finally, the results indicated that the model has a high level of performance in simulation flow discharge and sediment yield simulation, and it can be used for operating watershed management strategies. | ||
کلیدواژهها [English] | ||
Haraz Basin, Runoff, Sediment, SUFI2 algorithm, SWAT Model | ||
مراجع | ||
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