3558

3361

كارشناسي ارشد

آبياري و زهكشي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1385

شانزده، 192، [II] ص.: مصور، نمودار، جدول

ص. ع. به فارسي و انگليسي

فرهاد موسوي، منوچهر حيدرپور

مجيد افيوني، احمد جلاليان

16/4/86

سعيد اسلاميان، حسين خادمي

1396/02/31

كتابنامه

كشاورزي

مهندسي كشاورزي

ID3361

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

AbstractSoil erosion is one of the most important economical social and environmentalproblems On the basis of available information Asia suffers more than the othercontinents from soil erosion and Iran is one of the countries that is mostly affected Watershed management is an approach for erosion reduction In Iran most mountainouswatersheds do not have enough hydrometery stations and defective stations have sparsedata Because of limited availability of hydrologic data watershed modeling plays acrucial role in development of local resources Mathematical models are employed foraddressing a wide spectrum of water resources problems In this study SWAT2000 wasapplied to simulate runoff and sediment in Beheshtabad watershed a sub basin ofNorthern Karun catchment central Iran with an area of 3860 km2 This model predictsthe impact of land management practices on water sediment and agricultural chemicalyields in large watersheds with varying soils land uses and management conditionsover long periods Calibration and uncertainty analysis were performed with SUFI 2program The model was run for period of 1996 2004 and data of six hydrometerystations at Beheshtabad watershed were used for calibration and validation Three fourth of data for any station was used for calibration and the rest for validation P factor d factor R2 and Nash Sutcliffe values were used to assess the ability of SWATto estimate runoff and sediment The results of the model to simulate monthly runoff ofBeheshtabad Kohesokhteh and Joneghan stations were satisfactory at calibration andvalidation stages For calibration of monthly runoff the p factor d factor R2 and Nash Sutcliffe values were 61 0 48 85 and 75 at Beheshtabad 86 1 1 74 and 72 atKohesokhteh and 66 0 94 67 and 62 at Joneghan stations respectively For validationof monthly runoff these values were 53 0 38 85 and 57 80 1 33 80 and 62 and 83 1 01 57 and 52 respectively The results showed that SWAT could not simulateextreme events For calibration of daily runoff the model estimated runoff atBeheshtabad Kohesokhteh and Joneghan stations satisfactorily but for validation itonly estimated daily runoff at Beheshtabad and Joneghan stations The simulations ofdaily sediment were weak For calibration of daily sediment model estimated sedimentat Beheshtabad and Kohesokhteh stations satisfactorily and for validation onlyestimated daily sediment at Kohesokhteh station For calibration of daily sediment p factor d factor R2 and Nash Sutcliffe values were 55 0 41 55 and 52 at Beheshtabadand 76 0 4 91 and 88 at Kohesokhteh stations respectively For validation of dailysediment these values were 83 0 43 77 and 74 at Kohesokhteh station So SWATpredicted runoff much better than sediment The weakness of the model to simulaterunoff for some months was probably due to simulation of snowmelt for thismountainous watershed assumptions of the model for percolation into a frozensaturated soil layer and lack of flow data The weakness of the model to simulatesediment was due to runoff simulation accuracy of data and dispersed data

فرهاد موسوي، منوچهر حيدرپور

مجيد افيوني، احمد جلاليان

سعيد اسلاميان، حسين خادمي