5:15 PM - 7:15 PM
[AHW22-P02] Desilting impact under varied hydrological conditions and desilting location
Keywords:Desilting Tunnel, SRH-2D, Desilting location, Desilting efficiency
In Taiwan, precipitation primarily originates from monsoons in spring and typhoons in summer, while winter sees relatively low rainfall. As a result, reservoirs are widely constructed to meet water demand. However, Taiwan's steep terrain and intense rainfall often lead to large amounts of sediment being transported into reservoirs, reducing their storage capacity due to sedimentation. Over the past few years, various sediment management measures have been actively implemented, with the construction of desilting tunnels being one such measure.
The desilting tunnel in Nanhua Reservoir is located in the midsection of the reservoir and is designed to discharge turbidity flows, achieving the goal of reservoir desilting. This study employs SRH-2D to simulate the desilting efficiency of the desilting tunnel in Nanhua Reservoir under peak flow conditions corresponding to different return periods. Additionally, different desilting location is also simulated and analyzed to assess desilting efficiency variations under different scenarios.
The results indicate that as the return period increases and the peak flow becomes higher, the desilting efficiency of the desilting tunnel in Nanhua Reservoir improves. Furthermore, the turbidity flows travel longer distances, and the reduction in sediment concentration becomes more pronounced. In addition, compared to the dam site location, the midsection location is better suited for sediment desilting.
The desilting tunnel in Nanhua Reservoir is located in the midsection of the reservoir and is designed to discharge turbidity flows, achieving the goal of reservoir desilting. This study employs SRH-2D to simulate the desilting efficiency of the desilting tunnel in Nanhua Reservoir under peak flow conditions corresponding to different return periods. Additionally, different desilting location is also simulated and analyzed to assess desilting efficiency variations under different scenarios.
The results indicate that as the return period increases and the peak flow becomes higher, the desilting efficiency of the desilting tunnel in Nanhua Reservoir improves. Furthermore, the turbidity flows travel longer distances, and the reduction in sediment concentration becomes more pronounced. In addition, compared to the dam site location, the midsection location is better suited for sediment desilting.