http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/58 2026-05-17T14:33:45Z 2026-05-17T14:33:45Z Nguyen, Thi Hai Nguyen, Thi Quy Hoi Tran, Thi Mai Hoa http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/261 2011-04-17T02:43:47Z 2008-01-01T00:00:00Z

Territorial organization for ecotourism development in Hoang Lien National Park, Sapa District, Lao Cai Province Nguyen, Thi Hai; Nguyen, Thi Quy Hoi; Tran, Thi Mai Hoa Hoang Lien National Park, what is located in Sa Pa District, Lao Cai Province, has been planned to develop priority in ecological tourism because the park is composed by many ecological systems with the most diversiform biology in Vietnam. Here exists many endemic species, beautiful landscapes, as well as typical cultures of local inhabitants. According to statistical data, the number of tourism arrivals to the area grew up rapidly. Since 2000 to 2006, the figure was increased by 39.1%. There was a continual increase in its tourism revenue as well as diversity in its effective tours. However, many principles of ecotourism were not fully applied. Little profit was shared among local community while most of revenue came back to outsiders. The result was the degradation of the national park’s environment and its natural resources in spite of the development of tourism. Moreover, the living standard of local people was not much improved: 21% of households lived in poor condition without any benefit from tourism activities. To sustainably develop tourism in the park, simultaneously to support local community in preservation and socio-economic development, there is a need of researching and organizing tourism territory. Hence, based on analysis and assessment of related resources, the paper is focused on suggesting some orientations for tourism territorial organization of Hoang Lien National Park. The obtained results show that the territory for ecotourism should be divided into three sub-regions coinciding with its current functional zones of the park: prohibited area, limited area and area open for tourism development. Other relevant solutions such as operating new ecotours, re-educating local human force, etc. are also suggested to enhance the effectiveness of tourism activities and to upgrade the living quality of local people. VNU Journal of Science, Earth Sciences. Vol. 24 (2008), No.1, P. 1-9

2008-01-01T00:00:00Z Phung, Dang Hieu http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/260 2011-04-17T02:40:05Z 2008-01-01T00:00:00Z

Finite volume method for long wave runup: 1D model Phung, Dang Hieu A numerical model using the 1D shallow water equations was developed for the simulation of long wave propagation and runup. The developed model is based on the Finite Volume Method (FVM) with an application of Godunov - type scheme of second order of accuracy. The model uses the HLL approximate Riemann solver for the determination of numerical fluxes at cell interfaces. The model was applied to the simulation of long wave propagation and runup on a plane beach and simulated results were compared with the published experimental data. The comparison shows that the present model has a power of simulation of long wave propagation and runup on beaches. VNU Journal of Science, Earth Sciences. Vol. 24 (2008), No.1, P. 10-15

2008-01-01T00:00:00Z Doan, Dinh Lam Nguyen, Trong Tin Nguyen, Thi Hong http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/259 2011-04-17T02:34:06Z 2008-01-01T00:00:00Z

Margin deltas in the northern part of the Red River basin Doan, Dinh Lam; Nguyen, Trong Tin; Nguyen, Thi Hong Margin deltas are the last ones that were formed in a shelf break zone, when a sea level has slowdown during last time of a forced regression and the beginning of the success transgression. The margin deltas are abruptly thickened in the zone of shelf break, became thinner landward and basinward. Because they were formed in the shelf edge, they have a relatively high sand/clay ratio, prone to turbidite. In the northern part of the Red River basin, during the Miocene the margin deltas had developed eastward from the plot 103, i.e. from the borehole 103-TH-1X, 103-TG-1X and 103-HOL seaward. An existence of the margin deltas in this region confirms a presence of the basin floor fans in the central part of basin - very important objects for oil-gas prospecting. VNU Journal of Science, Earth Sciences.Vol. 24 (2008), No.1, P. 16-25

2008-01-01T00:00:00Z Nguyen, Van Nhan http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/258 2011-04-17T02:28:46Z 2008-01-01T00:00:00Z

Formations of endogenous ore deposits and mineralization in Vietnam Nguyen, Van Nhan Formations of endogenous ore deposits and mineralization are widely distributed in Vietnam. Detailed studies allow for distinguishing 30 ore formations representing 9 groups of mineral raw - materials: Cr, Ti, Fe, Sn - W, Mo, Pb - Zn, Au, Sb - Hg. Three of presented formations are of magmatic affiliation, one is pegmatitic, three others belong to skarn mineralization and the remaining ones are of hydrothermal - volcanic and controversial origin. Three metallogenic epochs can be distinguished: Proterozoic, Palaeozoic and Mesozoic - Cainozoic. Taking into consideration the recent structural data and economic importance along with the geochemical units can be distinguished in Vietnam: 1. Sialic - mafic Viet Bac; 2. Mafic Tay Bac; 3. Sialic Truong Son; 4. Mafic - metamorphic Kontum; 5. Sialic - alkaline Dalat - Nam Bo. VNU Journal of Science, Earth Sciences. Vol. 24 (2008), No.1, P. 26-31

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