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آنالیز حساسیت مولفه‌های هیدروگراف جریان به تغییر در پارامترهای روش زمان – مساحت کلارک در آبخیز محمدآباد استان گلستان | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 9، دوره 49، شماره 1، فروردین و اردیبهشت 1397، صفحه 91-99 اصل مقاله (476.64 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2018.221333.667580 | ||
| نویسندگان | ||
| رئوف مصطفی زاده* 1؛ شهناز میرزایی2؛ اباذر اسمعلی3؛ محسن ذبیحی4 | ||
| 1استادیار گروه مرتع و آبخیزداری، دانشکده علوم کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی | ||
| 2دانشجوی کارشناسی‌ارشد مهندسی آبخیزداری، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی | ||
| 3دانشیار گروه مرتع و آبخیزداری، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی | ||
| 4دانشجوی دکتری علوم و مهندسی آبخیزداری، دانشگاه تربیت مدرس | ||
| چکیده | ||
| کاربرد مدل هیدروگراف واحد لحظه‌ای کلارک به جهت نیاز به داده‌های سهل‌الوصول در آبخیزهای فاقد ایستگاه هیدرومتری از اهمیت خاصی برخوردار است. هدف تحقیق حاضر شبیه‌سازی هیدروگراف واحد جریان آبخیز محمدآباد استان گلستان با استفاده از روش زمان - مساحت و انجام آنالیز حساسیت (نسبی و مطلق) نتایج شبیه‌سازی در آبخیز مورد مطالعه است. برای تعیین تغییرات سطح حوزه نسبت به زمان تمرکز (هیستوگرام زمان-مساحت) از روش دیاگرام بی‌بعد (روش لاورنسن) استفاده شده و سپس هیدروگراف واحد لحظه‌ای با مدل کلارک برای آبخیز مذکور شبیه‌سازی شد. آنالیز حساسیت مدل کلارک با تغییر دو پارامتر زمان تمرکز و ضریب ذخیره صورت گرفته و سپس حساسیت نسبی و مطلق مدل در برآورد مولفه‌های هیدروگراف واحد جریان تعیین گردید. هم‌چنین هیدروگراف واحد مشاهداتی سیل در آبخیز با استفاده از منحنی S محاسبه و دقت مدل مذکور در برآورد هیدروگراف واحد آبخیز با معیار نش-ساتکلیف مورد ارزیابی قرار گرفت. براساس نتایج، دقت مدل مذکور در شبیه‌سازی هیدروگراف واحد جریان 71 درصد است. نتایج آنالیز حساسیت مدل نشان داد که حساسیت نسبی مدل در برآورد دبی اوج هیدروگراف واحد جریان به پارامتر ضریب ذخیره برابر 66/0- می‌باشد. هم‌چنین حساسیت مطلق مدل به پارامتر زمان تمرکز برابر 76/2- می‌باشد. در مجموع می‌توان گفت که پارامتر حساس در برآورد دقیق زمان تا اوج، متغیر زمان تمرکز محاسباتی جریان می‌باشد. | ||
| کلیدواژه‌ها | ||
| هیدروگراف واحد؛ حساسیت نسبی؛ حساسیت مطلق؛ هیستوگرام زمان - مساحت؛ آبخیز محمدآباد | ||
| عنوان مقاله [English] | ||
| Sensitivity analysis of the flow hydrograph components due to changes in Clark's time-area model in Mohammad-Abad watershed, Gloestan Province | ||
| نویسندگان [English] | ||
| Raoof Mostafazadeh1؛ Shahnaz Mirzaei2؛ Abazar Esmali3؛ Mohsen Zabihi4 | ||
| 1Professor (Assistant) Department of Rangeland and Watershed Management, Faculty of Agricultural Sciences and Natural Resources University of Mohaghegh Ardabili | ||
| 2M.Sc. student of Watershed Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili | ||
| 3Associate Professor, Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili | ||
| 4Ph.D Student of Watershed ‎Management Science and Engineering, Tarbiat Modares University | ||
| چکیده [English] | ||
| The Clark Instantaneous Unit Hydrograph is getting popular because of its easy accessible parameters and application to ungauged catchments. This study focuses on simulating the unit hydrograph of Mohammad-Abad watershed, Golestan Province and analysis of relative and absolute sensitivity analysis of the Clark time-area model. The time-area histogram of the study area were identified using dimensionless Laurenson’s method. The instantaneous unit hydrograph of study area was also calculated by the Clark model and then converted to direct runoff unit hydrograph. The sensitivity analysis of the Clark model has been conducted by changing the input model parameters (time of concentration and storage coefficient) to obtain the relative and absolute sensitivity of the model to estimate the unit hydrograph components. The observed index unit hydrograph were derived using S-curve method and the efficiency of Clark IUH model in predicting hydrologic watershed response hydrograph was evaluated by Nash-Sutcliffe efficiency criterion. The results showed that the model efficiency was 71% in predicting the response of unit hydrograph. The model sensitivity analysis indicated that the relative sensitivity of the Clark model to storage coefficient parameter was -0.66 in estimation of peak discharge of unit hydrograph. Also the absolute sensitivity of the model was -2.76 with respect to changes in concentration time. It can be concluded that the time of concentration was the sensitive parameter in accurate estimation of time to peak of unit hydrograph. | ||
| کلیدواژه‌ها [English] | ||
| Unit Hydrograph, Relative sensitivity, Absolute sensitivity, Time-area histogram, Mohammad-Abad watershed | ||
| مراجع | ||
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