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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Human impact on river channel changes downstream of changzhou hydro-junction on the xi river (xijian...
Human impact on river channel changes downstream of changzhou hydro-junction on the xi river (xijiang), china
Dams impose changes of flow and sediment transfer. In addition due to release of clear water and unsteady flow during
dam operations, the downstream channel bed tends to erode. The degradation process may be greatly aggravated by
human impacts, including river sand mining and channel restoration projects, which probably produce a large drop in
water level. When the changes are beyond estimates, the safety of waterway navigation is threatened because the water
depth at the ship-lock is not sufficient to accommodate a ship¡¯s draft. It is especially problematic when this occurs in the
near-dam reach downstream of the hydro-junction. Changzhou hydro-junction, a low head hydro-electric station located
downstream of the Xijiang River in Guangxi province of China, provides power generation, navigation, and flood control.
It is famous in China as the world¡¯s largest river ship-lock, having four-parallel lock chambers. However, the first double
lock chambers, completed in 2007 have been facing a navigation crisis caused by low water levels, and the other double
lock chambers went into construction two years later. On the basis of the field topographical and hydrological data, this
study analyzed variations of the river bed and low water levels. Furthermore, it studied the channel responses to multifactors
dominated by human impact. The results show that during the early years of Changzhou dam impoundment form
2007 to 2012, the diminishing water level under the same rates of discharge has largely resulted from integrated dam
operations factors, extensive mining, and channel restoration. Furthermore, the latter two were the main factors that
caused the present low water level. These results provide a valuable reference for channel regulation.
File Size : 2,436,371 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 27/08/2015
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