Abstract
Abstract Because of multifunctional weirs installed as part of large river regulation works in Korea, water quality problems have arisen from environmental changes in tandem with decreased flow rates. However, there has been limited research into the green algae removal effect, water quality improvement in congested waters, dam and weir operations, and consequential riverbed changes. Studies regarding outflow in a basin, the application and development of sediment load output analysis methods, feasibility of related dam operations, and riverbed patterns have been separately performed. However, basins and rivers should be analyzed by an integrated method instead of an individual one. Therefore, in the present study, the effect of congestion on a river connected to a dam/weir and estuary bank was analyzed based on climate change scenarios HadGEM3-RA RCP 4.5 and 8.5, with the aim of integrating individual studies using watershed and river models. Flow was controlled by dam- and weir-related discharge simulations. Variations in the riverbed caused by the transfer of suspended load in the downstream region were analyzed for both long and short durations. The results of this analysis suggest that given future climate change scenarios, the width of the river and riverbed variations in the riverbed are expected to rise.
Highlights
Global warming and climate change are some of the gravest threats on earth, a fact agreed upon by most countries
We studied the upper stream of the Nakdong River basin and the section between the downstream area of Andong
Rainfall was analyzed by the climate scenario for 2100 (Figure 5)
Summary
Global warming and climate change are some of the gravest threats on earth, a fact agreed upon by most countries. Many studies have aimed to develop strategic responses at a national level, such as policies to reduce greenhouse gas emissions, to mitigate in advance the risks of climate change and destruction of social systems (Mora & Zapata ).
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