Đánh giá tác động của hồ chứa và biến đổi khí hậu tới bùn cát sông Nậm Mu
Abstract
Reservoirs in Nam Mu river has a flood prevention capacity of over 2 billion m3, playing an important role in natural disaster prevention, flood reduction, dike breaking risk and provide irrigation water in the dry season for the large plains in the North. Dam construction in the upstream area is the cause of changes in natural factors, leading to negative aggregate impacts for the downstream area along with common problems such as reservoir sedimentation, serious erosion of river bed and riverbank in downstream. This paper applies erosion, sediment transport and reservoir sedimentation models to simulate the effects of reservoirs construction and climate change on sediment transport in Nam Mu river. The results show that if only considering climate change, the amount of sediment increases, when considering the combination of the influence of the reservoir and climate change, the result is a significant decrease in the amount of sediment transportation. The research results are the basis for the construction of works to remove sediment and discharge to the downstream for new and built reservoirs.
