Facebar la free#

In the framework of the KUN-SHEN project, 7 months of monitoring (2011-2012) provided 20 topobathymetric surveys (within a 200 m long segment of the barrier from the subtidal zone to the back-barrier) and acquisitions of offshore, nearshore and shallow water hydrodynamics including velocity profiling, free surface measurement and absolute pressure. This study focuses on the dynamics of the Wan-Tzu-Liao sand barrier when it is struck by one typhoon, a group of typhoons or the whole season of typhoons and monsoon. The complicated interactions between seasonal freshwater flows and high range tides increase the complexity of hydrodynamics in Dinh An estuary, and this is one of the main reasons why the navigation channel route has such a strongly complicated variation. It indicated that the formation of geomorphology has created the position of tidal channels for years. In this paper, based on measurement data from 1980 to 2005 and numerical model results, the formation process and characteristics of crescent bars and is presented. The channel needs to be dredged twice a year, and a significant budget is allocated to maintain the navigation conditions. The sizes of ships sailing on the Bassac River only vessels of less than 5,000 DWT can pass through the navigation channel. The estuary entrance has a limited water depth due to the presence of highly dynamic shoals, and crescent bars restrict the local society and economy development. The morphological evolution of the navigation channel is complicated and unstable.

An international navigation channel was built in the estuary for vessels traveling from the South China Sea to the southwestern area of Vietnam and then to Phnom Penh, Cambodia. The proposed approach provides information at a more relevant spatiotemporal scale at which these systems evolve, which is helpful to coastal scientists and managers.ĭinh An Estuary is one of two estuaries of Bassac River, Vietnam. Their capability of acquiring high-resolution imagery in large spatial extent is superior in continuous observation and characterization of nearshore bars. Our study demonstrates that VHR satellite remote sensing is a viable alternative with comparative results to video monitoring systems.

Nearshore bars were successfully identified and characterized as single and multiple bar systems. A rule-based classification object-based image analysis approach is introduced to identify nearshore bars (and their characteristics, such as bar length, width, count, and distance from the wet/dry line) from very-high-resolution (VHR) multispectral imagery.

Our study introduces a lower cost alternative to study these coastal features.

Facebar la install#

These systems are costly to install and maintain, and a limited number of stations are available. Video monitoring systems, such as Argus, have been the favored remote sensing approach for studying nearshore bars dynamics and evolution. Historically, in situ methods were used to study beach-dune dynamics and nearshore bars.

Nearshore bars are important coastal features that influence beach-dune dynamics and protect the coast from high-energy wave events.