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مقایسۀ خصوصیات واکنشی و بیلان حجمی آب در سه روش هیدروگراف واحد (مطالعۀ موردی: حوضۀ آبخیز ونک) | ||
اکوهیدرولوژی | ||
مقاله 3، دوره 5، شماره 2، تیر 1397، صفحه 373-385 اصل مقاله (889.55 K) | ||
نوع مقاله: پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ije.2017.232144.574 | ||
نویسندگان | ||
سمیرا بیاتی1؛ محمدعلی نصر اصفهانی2؛ خدایار عبدالهی* 3 | ||
1دانشجوی کارشناسی ارشد مهندسی منابع آب، دانشکدۀ کشاورزی، دانشگاه شهرکرد | ||
2استادیار، دانشکدۀ کشاورزی، دانشگاه شهرکرد | ||
3استادیار، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه شهرکرد | ||
چکیده | ||
هیدروگراف واحد، یک روش شبیهسازی سیلاب در پاسخ به یک واحد بارش مازاد روی کل حوضۀ آبخیز است که بر پایۀ اصول سیستمی انطباق و تناسب عمل میکند. روشهای متفاوتی از هیدروگراف واحد ارائه شده است که عملکرد آنها در شرایط محلی حوضههای آبخیز متفاوت است. در این تحقیق بهمنظور مقایسۀ عملکرد این روشها با استفاده از مدل هیدرولوژیکی HEC-HMS و با اعمال روش احتسابکنندۀ رطوبت خاک (SMA) و روش مخزن خطی بهترتیب برای محاسبۀ میزان تلفات و جریان پایۀ حوضه، هیدروگراف سیلاب و مشخصات آبنمود سیل شامل دبی اوج و حجم رواناب با استفاده از سه روش هیدروگراف واحد اشنایدر، کلارک و SCS شبیهسازی شد. برای مقایسۀ کارایی مدلها، ضریب کارایی نش– ساتکلیف به عنوان تابع هدف در نظر گرفته شد. پارامترهای هیدرولوژیکی مدل به صورت دستی و با استفاده از روش سعی و خطا ارزیابی و واسنجی شد. نتایج نشان داد درصد اختلاف بین حجم رواناب مشاهداتی و شبیهسازیشده در هر سه روش کاملاً نزدیک بود. در حالی که از نظر دبی اوج، روش هیدروگراف واحد کلارک با ضریب کارایی نش– ساتکلیف 68/0 کمترین میزان درصد اختلاف بین دبی اوج مشاهداتی و شبیهسازیشده را نشان داد. | ||
کلیدواژهها | ||
حوضۀ آبخیز ونک؛ مدل HEC-HMS؛ نش- ساتکلیف؛ هیدروگراف واحد | ||
مراجع | ||
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