Numerical simulation of fluid mud layer under current and waves in estuaries and coastal areasThe formation and development of fluid mud layer in estuaries and coastal areas are numerically simulated and successfully applied to the Severn estuary as an illustration example. Using the finite difference method, numerical solutions for the mathematical models are obtained, in which ADI method with staggered grid for the derivative in respe...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 622 | Lượt tải: 0
Numerical. simulation of fluid mud layer in estuaries and coastal areasA numerical simulation for the formation and moving of fluid mud in estuaries and coa.stal area.s is implemented and applied to the Severn estuary a.s an illustration example. The finite difference method is used, in which ADI method with staggered grid for the derivative in respect to space and Leap-frog scheme for time is used for tidal flow m...
10 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 498 | Lượt tải: 0
3-D numerical simulation of the tidal circulation in the gulf of Tonkin, Vietnam- A numerical simulation for the tidal circulation in the Gulf of Tonkin has been performed. The model was calibrated and verified by 6 observed stations when setting the horizontal diffusivity constant and tuning the Chezy coefficient. The results show a quite good agreement between the computed results and the observations in both of the cali...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 559 | Lượt tải: 0
A numerical model for the tidal oscillation and current in the gulf of tonkinThe numerical model based on TIDEFLOW-2D for the tidal levels and currents for the Gulf of Tonkin was established and tested carefully. The testing results show a good agreement and this model can be used for simulation the tidal movement in the Gulf. Results of such like simulation will be published later. The paper was accomplished partly tha...
9 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 591 | Lượt tải: 0
Improved method for hydrochemical exploration of mineral resourcesA method for hydrochemical exploration and poorly studied areas is proposed on the basis of this model. The distinguishing feature of this method is the determination of prospective sections using the following criteria: (1) maximum ratio of the area of the drainage basin at a river source without a pronounced channel network to the total are...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 647 | Lượt tải: 0
Construction of initial national quasi-Geoid model VIGAC2017, first step to national spatial reference system in VietnamIn the epoch of application of GNSS technology, the task of the construction of the national spatial reference system becomes the most important research content of high geodesy, that concentrates in itself the most important achievements in fields of the physical geodesy and geometrical geodesy. The key problem of the aforementioned task i...
12 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 564 | Lượt tải: 0
Assessment of earthquake-Induced ground liquefaction susceptibility for Hanoi city using geological and geomorphologic characteristicsSoil liquefaction is a major cause of damage during earthquakes. The liquefaction susceptibility map displays the zones with liquefaction potential, or the risk of initiation of liquefaction during future earthquakes and can be used as the input for calculation and mapping of liquefaction hazard map of the study area. Being a qualitative functio...
16 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 601 | Lượt tải: 0
Shifting challenges for coastal green citiesCities are in quasi permanent transition. Organizing them taking into account the principles and dynamics of the urban metabolism as revealed by a greensustainable-smart-blue city approach might alleviate many problems which increased over the years. Acting on the major challenges reviewed in this paper will necessitate new processes of deci...
21 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 688 | Lượt tải: 0
A Digital Shoreline Analysis System (DSAS) applied on mangrove shoreline changes along the Giao Thuy Coastal area (Nam Dinh, Vietnam) during 2005-2014Overall the mangroves in the Giao Thuy district increased by 2486.96 hectares during 2005-2014. Among the 272 DSAS transects in this study, 126 showed mangrove shoreline regression, while the mangrove forests increased in the 146 other transects. The degradation rate is calculated at 1.41 m yr-1, and the growth rate is 1.26 m yr-1on average. T...
10 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 496 | Lượt tải: 0
New discovery of late early ordovician graptolites and discussion on stratigraphic sequence of paleozoic sediments in the Dinh Ca - Trang Xa Section, Vo Nhai Disctrict, Thai Nguyen Province, Northeast Vietnamhina plays an important role for stratigraphic correlation of Lower Paleozoic sediments in Northern Vietnam. It serves as the basic data for establishing new lithostratigraphic unit termed as the Dinh Ca Formation in the northeastern region of Vietnam. Acknowledements The study was conducted as part of the project “Paleontological collection ...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 487 | Lượt tải: 0
