%0 Journal Article
%T Effects of Influential Parameters on Long-Term Channel Evolution Following Low-Head Dam Construction and Removal
%A Sinae Kim
%A Yuji Toda
%J Journal of Water Resource and Protection
%P 780-793
%@ 1945-3108
%D 2018
%I Scientific Research Publishing
%R 10.4236/jwarp.2018.108044
%X The long-term existence of dam structures significantly modified the river channel. In accordance with a drastic increase of low-head dams under consideration for removal in recent years, it is important to predict the effects of low-head dam removal from the modified river channel by the low-head dam construction. This study intends to investigate the long-term channel evolution process following low-head construction and removal and to find out the influential parameters (sediment diameter, river bed slope, dam height) for those channel evolution by two-dimensional numerical simulation model. Following the low-head dam construction, sediment deposition rates in upstream of the low-head dam are varied with the influential parameters. The sediment deposition rates and sandbar formation with riparian vegetation settlement on sandbars have significantly affected for channel evolution following low-head dam removal. Especially the knickpoint formation and the types of vegetation (grass type and tree type) on the sandbars are critical factors for channel evolution following low-head dam removal. Through the numerical simulation results of low-head dam construction (50 years) and low-head dam removal (50 years), it is identified that the modified river channel by low-head dam may not be easily restored to pre-dam conditions following its removal especially in river geomorphology and riparian vegetation. Consequently, this study found that the reversibility following low-head dam construction and removal depends on the sediment deposition rates in upstream of the low-head dam.
%K Low-Head Dam
%K Dam Construction
%K Dam Removal
%K Channel Evolution
%K Influential Parameter
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=86729