کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6432037 1635401 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sediment budget as affected by construction of a sequence of dams in the lower Red River, Viet Nam
ترجمه فارسی عنوان
بودجه رسوب به عنوان تحت تاثیر ساخت و ساز از یک دنباله از سدها در پایین رودخانه سرخ، ویتنام
کلمات کلیدی
اثرات سد، بودجه رسوب، رسوب رسوب، رودخانه سرخ، ویتنام،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی

Dam construction is one of the main factors resulting in riverine sediment changes, which in turn cause river degradation or aggradation downstream. The main objective of this work is to examine the sediment budget affected by a sequence of dams constructed upstream in the lower reach of the Red River. The study is based on the longer-term annual data (1960-2010) with a complementary daily water and sediment data set (2008-2010). The results showed that the stretch of the river changed from sediment surplus (suggesting possible deposition processes) into sediment deficit (possible erosion processes) after the first dam (Thac Ba Dam) was constructed in 1972 and changed back to deposition after the second dam (Hoa Binh Dam) was constructed in 1985. The annual sediment deposition varied between 1.9 Mt/y and 46.7 Mt/y with an annual mean value of 22.9 Mt/y (1985-2010). The sediment deposition at the lower reach of the Red River would accelerate river aggradation which would change river channel capacity in the downstream of the Red River. The depositional processes could be sustained or changed back to erosional processes after more dams (the amount of sediment deposit was much less after the latest two dams Tuyen Quang Dam in 2009 and Sonla Dam in 2010) are constructed, depending on the water and sediment dynamics. This study revealed that the erosional and depositional processes could be shifted for the same stretch of river as affected by a sequence of dams and provides useful insights in river management in order to reduce flood frequency along the lower reach of the Red River.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 248, 1 November 2015, Pages 125-133
نویسندگان
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