محاكاة عددية وفيزيائية لتحسين الأداء الهيدروليكي للقنوات المبطنة باستخدام السدود القابلة للنفخ
محتوى المقالة الرئيسي
الملخص
عد النبؤ بتدفق المياه احد الاهتمامات المهمة لعماء المياه والمهندسين لتخطيط وادارة موارد المياه وتصميم مشاريع موارد المياه .يمكن ان يوفر التنبؤ بتدفق المياه على المدى الطويل والقصير معلومات قيمة حول امكانية تصميم مشروع المياه .
السدود المطاطية وتمسى اضا السدود القابلة للنفخ تكون مصنوعة من هياكل مطاطية اسطوانية مرنة قابلة للنفخ والتمدد متصلة بقاعدة صلبة اما في احد الطرفين او من كلا الطرفين ( مرساه واحدة او مزدوجة ) ويتم نفخها بالهواء او الماء او مزيج من كليهما .
تهدف هذه الورقة الى تحسين الاداء الهيدروليكي لقناة شط ال ابراهيم من خلال قياس عمق التدفق وارتفاع سطح الماء وتوزيع السرعة باستخدام السد القابل للنفح ومقارنة بعمق الماء وارتفاع سطح الماء قبل وضع السد عند تصريف الندرة ( 2 م3/ثانية ) . تم انشاء نموذج رقمي احادية- ثنائية الابعاد وتحليلها باستخدام برنامج HEC-RAS ,ومعايرته مع النموذج الفيزيائي .
اظهرت نتائج الدراسة الى زيادة ارتفاع سطح الماء خلال القناة بعد وضع السد القابل للنفخ مقارنة بالظروف الاعتيادية ( عدم وجود السد ) بنحو 1.32 م في منطقة السد و 0.16 م عند بداية القناه في حين ان السرعة في مقدم ومؤخر السد لا تؤثر على القناة ولا يحدث تأكل في كونكريت ارضية القناة .وان نتائج معايرة النموذج العددي مع النموذج الفيزيائي أظهرت نتائج مقبولة ( اكثر من 85% ) باستخدام طريقة الجذر التربيعي .
تفاصيل المقالة
القسم
كيفية الاقتباس
المراجع
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