بررسی مقایسه‌ای مدل متداول و واسنجی شده شماره منحنی در برآورد سیلاب و رواناب (حوضه‌های مورد مطالعه: گالیکش، تمر، وطنا، کچیک و نوده در استان گلستان)

نویسندگان

1 دانش آموخته کارشناسی ارشد ، گروه مهندسی آب دانشکده مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 گروه مهندسی آب دانشگاه علوم کشاورزی و منابع طبیعی گرگان

3 عضو هیئت علمی و دانشیار گروه علوم و مهندسی آب دانشگاه علوم کشاورزی و منابع طبیعی گرگان

4 گروه مهندسی آب دانشکده آب و خاک دانشگاه علوم کشاورزی و منابع طبیعی گرگان،ۀ گرگان، ایران

چکیده

مدل متداول شماره منحنی (SCS-CNT) که بر اساس کاربرد جدول پیشنهادی توسط سازمان حفاظت خاک آمریکا (SCS) است به طور گسترده­ای توسط محققین و مهندسین مورد استفاده قرار می­گیرد. لیکن ممکن است ویژگی­های حوضه آبریز مورد بررسی کاملا متفاوت با شرایط استخراج مدل SCS-CNT باشد. واسنجی مدل شماره منحنی (SCS-CNC) می­تواند یک راه حل در این زمینه باشد. در این مطالعه، 37 رویداد بارش - رواناب در پنج حوضه آبریز تمر، گالیکش، نوده، وطنا و کچیک (به­ترتیب با مساحت­های 1527، 45/401، 65/789 ، 77/10 و 36 کیلومترمربع) در استان گلستان مورد بررسی قرار گرفت و از 14 رویداد برای مقایسه مدل­های SCS-CNT و SCS-CNC استفاده گردید. مقایسه نتایج بر اساس معیارهای آماری ریشه میانگین مربعات خطا (RMSE)، ناش - ساتکلیف (NSE) و خطای برآورد دبی اوج (PEP)  صورت گرفت. معیارهای RMSE و NSEدر 79% موارد بهبود دقت برآورد هیدروگراف و معیار PEP در 86% موارد بهبود دقت برآورد دبی اوج در مدل SCS-CNC نسبت به مدل SCS-CNT را تایید کردند. مدل­های SCS-CNC و SCS-CNT به ترتیب در 8 و 7 رویداد منجر به کم­برآوردی و در 6 و 7 رویداد موجب بیش­برآوردی دبی اوج شده­اند. نتایج موید آن است که کاربرد مدل واسنجی شده شماره منحنی موجب بهبود نتایج شبیه­سازی در پنج حوضه مورد مطالعه شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Comparative assessment of conventional and calibrated curve number models in flood and runoff estimation (Studied Catchments: Galikesh, Tamer, Nodeh, Kechik and Vatana in Golestan province)

نویسندگان [English]

  • sanaz Daei 1
  • Meysam Salarijazi 2
  • khalil ghorbani 3
  • Mehdi Meftah Halaghi 4
1 MSc. of Water Resources Engineering, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
2 Water Engineering Department, Gorgan University of Agricultural Sciences and Natural Resources
3 Associate Professor, Department of Water Science and Engineering, Gorgan University of Agricultural Sciences and Natural Resources
4 Soil & Water Dep. university of Grgan natural resources & Agricultural science, gorgan,Iran;
چکیده [English]

 The conventional curve number (SCS-CNT) model, which is based on the application of the proposed table by US Soil Conservation Service (SCS), is widely used by researchers and engineers. However, characteristics of the study catchment may be completely different from the conditions for the extraction of SCS-CNT model. Calibrated curve number model (SCS-CNC) can be a solution in this problem. In this study, 37 rainfall-runoff events were investigated in Tamer, Galikesh, Nodeh, Vatna and Kechik catchments (with area 1527, 401.45, 789.65, 10.77 and 36 square kilometers respectively) located in Golestan province, Iran, and 14 events were used for SCS-CNT and SCS-CNC models’ comparison. Results were compared based on root mean square error (RMSE), Nash-Sutcliffe (NSE) and peak discharge estimation error (PEP). The RMSE and NSE criteria in 79% and PEP criterion in 86% of the cases confirmed improvement of the hydrograph and peak discharge estimations in SCS-CNC compared to SCS-CNT model. The SCS-CNC and SCS-CNT models resulted in peak discharge underestimation in 8 and 7 events and overestimation in 6 and 7 events, respectively. Results indicated that application of the calibrated curve number model improves the simulation results in all five studied catchments.

کلیدواژه‌ها [English]

  • CN
  • flood
  • Hydrograph
  • Peak Discharge
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