This paper presents an estimation of the velocity of the Earth’s crust in Vietnam and the Southeast Asian region, determined from the GPS data in nearly 5 years (4/2005-12/2009) at 3 sites in Vietnam (Hanoi, Hue and Ho Chi Minh city) plus more than 20 ones in Southeast Asia and other regions using GAMIT software. The horizontal velocity vecto...
12 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 853 | Lượt tải: 0
Due to high economical and technical efficiency Geotextile reinforced soil technology is presently a widely applicable solution in construction of weak earth works, slope stability structures and in prevention of earthquake acceleration. However, there were difficulties in applying this technology in Vietnam as lack of a guidance on required p...
10 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 725 | Lượt tải: 0
From 2003 to recent, drought has been occurring widely in Red River Delta. Decreasing of flow of main river system, climate change and the operation unproperly of the upper reservoirs had led to water shortage of the downstream. In addition, increasing of water demand, degradation of water quality, and drought crisis management had made drough...
5 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 1038 | Lượt tải: 0
South Central Coastal provinces (including Quang Nam, Da Nang, Quang Ngai, Binh Dinh, Phu Yen, Khanh Hoa, Ninh Thuan and Binh Thuan) have an area of 40,655.7 km2 (equivalent to 12.5 % of total area of whole country). The article referred to the situation and causes for droughts in recent years. Thereby drought preventive measures are proposed...
7 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 864 | Lượt tải: 0
Researching on variation of coastal area in Cuu Long delta was based on chain dataset from 1952 to 2006, including : high resolution satellite photographs, air photographs and topographic maps. The results show that study areas have been changed by natural and human factors. The Ba Lai and Bat Xac areas are 2 within 9 river mouths in research...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 695 | Lượt tải: 0
In Neotectonic periods, the Thanh Ba region consists of three main tectono-structural blocks : the Northeastern block, the Central block and the Southwestern block, consisting of many active faults (mainly oriented to northeast - southwest). Activity of the active structures is one of the direct causes of ground faulting (in Yen Noi, Hanh Cu c...
11 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 716 | Lượt tải: 0
The Tay Giang - Phuoc Son section of Ho Chi Minh route locates at an active tectonic area. Active faulting is one of the main causes which are responsible for land cracking hazard in the route. - In the section, land cracking hazard can be observed at 18 sites, some locations were seriously damaged such as : A Tep, Za Hung, Ma Cooih, Phuoc X...
7 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 748 | Lượt tải: 0
Based on theoretical background of the normal height, the author points out the necessity to provide the same normal ellipsoid for calculation of the height anomaly and the geodetic height in GPS - levelling, and for receiving the normal gravity in normal height determination by using traditional levelling data. Accordingly the problems to be...
5 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 776 | Lượt tải: 0
The multiscale edge detection (MED) using wavelet transform was used to solve the inversion problem of gravity and geomagnetism to determine the positions and the depths of sources. In this paper, we used the line-weight function (LWF) to treat the observational data to enhance the resolution of the results of MED method. Firstly, the method...
7 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 627 | Lượt tải: 0
The expanded Hanoi area is large, but the investigation levels are different. Only in the old area (921 km2 area), assessment of groundwater (GW) reserves has been done, with high water potential. The potential GW reserves is about 6 million m3 per day which are mainly in quaternary sediments, specially in Pleistocene aquifer (qp) for water ...
7 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 704 | Lượt tải: 0
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