Characteristics of marine environmental geochemistry from Ha Tinh to Quang Nam (60-100 m water depth)Seawater is characterized by alkaline-weak oxidation and less effect by flows and activities from main lands and mainly contained of organic biodegradable materials. Surficial sediments of Ha Tinh - Quang Nam Sea (60-100 m in water depth) contained fineto coarse- grained size fractions. In which, the sediments with high absorbed capacity to ...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 650 | Lượt tải: 0
Assessment of geomorphic processes and active tectonics in Con Voi mountain range area (Northern Vietnam) using the hypsometric curve analysis methodThe hypsometric curves and its statistical moments are useful tools to assess the geomorphological processes and recent tectonic activity of the region as well as the comparison between different zones. The Day Nui Con Voi area has revealed 3 curves such as "straight- shape", "S- shape", and concave curves. The concave curve is the most commo...
15 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 732 | Lượt tải: 0
Probabilistic seismic hazard assessment for the Tranh River hydropower plant No2 site, Quang Nam provinceIn this paper, the results of probabilistic seismic hazard assessment (PSHA) for the Tranh river hydropower plant No2 site, Quang Nam province, are presented. A regional earthquake catalog updated until 2014 and most-recent data on active faulting in the area with a radial extent of 100 km from the HPP site were used. Advanced techniques in ...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 653 | Lượt tải: 0
High arsenic concentration in groundwater related to sedimentary facies in the Mekong River Delta, VietnamHigh content of As is usually found in 15- 70m wells around the Mekong and Bassac rivers located in the upper delta plain of the MRD. Some areas with a high density of 70- 80% tubewells have As levels of >500 µg/l located in Dong Thap and An Giang provinces. Most groundwater from 200 and 300 m in depth is safe. A combination of As concentra...
10 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 698 | Lượt tải: 0
Pre-Cenozoic tectonic deformation phases in the Muong Xen area, Nghe An provinceBased on the geological mapping and structural field observations, the following conclusions could be drawn: Before the Cenozoic, the Ca River fault zone was affacted by at least 2 tectonic movement periods, including the Indosinian (Permian - Triassic) and Yanshan (Jurassic - Cretaceous) expressed by three deformation phases. The first two...
12 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 544 | Lượt tải: 0
Continuous GPS network in Vietnam and results of study on the total electron content in the South East Asian regionThis study presents variations of monthly mean total electron content in the crest of South East Asian equatorial ionization anomaly by using data of the continuous GPS network along the meridian of 105E in both hemispheres. The TEC calculation using pseudoranges observed in GPS stations is represented. We can draw some conclusions as follo...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 625 | Lượt tải: 0
Using the analytic signal method of gravity gradient tensor (GGT) to determine the location and depth of the faults in the Pre-Cenozoic basement rocks of the Red River troughBased on the results obtained from the program construction, test on models and application the real data of the Red River trough, we can give few comments as follows: - Using analytic signals of a gravity gradient tensor (GGT) method to determine the ED of the directional analytic signals amplitude function helps overcome the phenomenon of ...
10 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 680 | Lượt tải: 0
Contaminant spreading by natural convection in a boxAt moderate Grashof number the three-dimensional natural convection with spreading contaminant in an enclosure can be modeled by Navier-Stokes equation in the Boussinesq approximation. Using the finite difference method based on the Samarski scheme to calculate the solution of the transport-type equations of vorticity, energy and contaminant and t...
12 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 667 | Lượt tải: 0
Nghiên cứu khả năng hấp thụ cacbon của rừng ngập mặn ven biển Hải PhòngMangrove is known as a big carbon sink in coastal areas. It is an important organic carbon source which provides for coastal ecosystems. The assessment of the carbon sequestration potential of mangrove contributes to making a scientific base for mangrove conservation and rehabilitation. In this study, the carbon sequestration of mangrove in the ...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 891 | Lượt tải: 0
Đặc điểm địa chất thuỷ văn, thủy địa hóa và tính phân đới của chúng ở vùng ven biển Việt NamVietnam has a long coastal line along which there are many plains that are composed of unconsolidated Kainozoic sediments in 5 granular aquifers overlying fissured ancient rock. The Holocene unconfined aquifer (qh) at the top of the profile contains fresh water lens with small potential water reserves. The Pleistocene (qp) and Neocene aquifers a...
7 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 1118 | Lượt tải: 0
