Đang chuẩn bị liên kết để tải về tài liệu:
Modelling bed level change at Nhat Le estuary and structural impacts using Delft3D

In recent years, Nhat Le estuary has been accreted due to the development of a spit bar in the south bank, which obstructs the waterway navigation, the flood drainage and causes erosion in the north bank endangering the infrastructures of Dong Hoi city. This study shows the simulation of short-term and long term bed level changes in 10, 50 and 100 years of the estuary and the impacts of applied structural solutions using Delft3D, a model developed by Delft Hydraulics. | Modelling bed level change at Nhat Le estuary and structural impacts using Delft3D Nguyen Quang Luong1 Abstract In recent years Nhat Le estuary has been accreted due to the development of a spit bar in the south bank which obstructs the waterway navigation the flood drainage and causes erosion in the north bank endangering the infrastructures of Dong Hoi city. This study shows the simulation of short-term and longterm bed level changes in 10 50 and 100 years of the estuary and the impacts of applied structural solutions using Delft3D a model developed by Delft Hydraulics. 1. Introduction Nhat Le is an estuary of Kien Giang River in Quang Binh province. The accretion of the estuary has caused not only the obstruction of the waterway navigation and the flood discharging see Figure 1 and but also the erosion of the north bank stranding fishermen on hundreds of ships as they bring their fish back to the mainland. Now all the ships must moor in the Gianh River about 40km far away or use smaller boats. The welfare and economic infrastructures on the left bank of Nhat Le estuary are now endangered. Figure 1. Map of Quang Binh and the topview of Nhat Le estuary Studying the coastal and estuarine accretion-erosion as well as forecasting their evolution in Quang Binh coastal zone has a considerably urgent scientific and realistic significance. Knowing the accretion-erosion patterns the forecast about the behaviour of the coastline and the flow channel at the estuary in the future and the proposals some counteractive measures to deal with the accretion-erosion problems can be made which contributes to socio-economic development planning in coastal zone. With the help of Delft3D model which provides a multi-disciplinary approach and numerical modelling for coastal river and estuarine areas the hydrodynamic factors relating to the accretion-erosion processes and the morphological changes in the study area will be simulated. Especially with the application of the structural .