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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Hydraulic analysis on wetland change along the submerged wier considering tides in han river korea
Hydraulic analysis on wetland change along the submerged wier considering tides in han river korea
Author : SUK-HWAN JANG(1), JI-HWAN OH(2) , DAL-SIK WOO(3) & JIN-TAK CHOI(4)
weir in Han river, Seoul Korea was built in early 1980¡¯s for the purpose of water level maintenance and
protection from sea water intrusion from the estuary. Its length is almost 1 km and 2.4 meter height which has two
composite structures of rigid and movable weir. Huge wetland developed called ¡°JANGHANG¡± as the results of weir
construction just down to the weir. However, recently social conflicts for the weir removal occurred for the river
rehabilitation and aqua-eco system recover. This study focused on hydraulic analysis, especially water level changes in
terms of with and without submerged weir along the tides where the height has 9 meters difference between ebb and high
tide. HEC-RAS for the 1-D simulation were used covering 25 km river length and tributaries. Tidal time series records and
discharge records from upstream dam of 1-year were and 2 submerged weirs as well as 25 bridges were considered in
boundaries. Hydraulic data in the 4 gauging stations were collected for the model calibration. Water level changes were
reviewed along 4 cases ¨C with/without weir and flood/dry season - The results showed that more than 3 meter difference
of water surface fluctuation along up and downstream including wetland as tide changes in a day. The wetland dimension
and water quality were also affected along the water level. The changes of water stage were to more than 3 meters high
and the wetland submerged more than 40%. The contraction of wetland area might cause the changes of aqua habitat to
plants and animals. Also erosion and deposition change happened widely from estuary to upstream. These results make it
difficult to make a decision of removal of the submerged weir. A comprehensive analysis of not only hydraulic but also
water quality and environmental effect should be consideredForm Required :
File Size : 1,092,634 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 28/08/2015
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