Một số phương pháp nghiên cứu ngưỡng mưa nhằm cảnh báo trượt lở đấtTo follow the experience of U.S. and European scientists using the rainfall thresholds for landslide warning, in this paper the author attempts to establish the preliminary rainfall thresholds causing landslides in Ha Giang province, on the basis of field works (2006-2008), the reports about natural hazards of locality, and the rainfall data o...
9 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 656 | Lượt tải: 0
Vai trò của rừng ngập mặn trong quản lí đới bờMangrove forests are classified as the most vulnerable ecosystem among the coastal ecosystems. Mangrove forests are also dynamic systems and have direct influences on coastal erosion and accumulation processes. Mangrove forests are considered as an effective and friendly barrier for the coastal habitants against high waves, storms and especi...
5 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 707 | Lượt tải: 0
Thoái hoá đất và quá trình hoang mạc hoá ở vùng nam Trung BộThe soil degaradation and desertification are affects resulting from the loss of the ecological balance by the natural processes and socio-economical activities in the arid, semi-arid and dry sub-humid areas. According the geo-synthetization, the soil degradation is a main cause leading to the desertification. In Central Southern of Vietnam, ...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 565 | Lượt tải: 0
Ứng dụng tư liệu MODIS hỗ trợ công tác quản lí tài nguyên và môi trườngApplication of modis data to support natural resource and environment management The paper introduces a new methodology in maps compiling from MODIS data to support environment and natural resource management. This is one of78 the research results of the basic research project 7009 06 titled : “Trial application of grid computing in environm...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 576 | Lượt tải: 0
Đánh giá xác xuất nguy hiểm động đất Bà Rịa - Vũng TàuProbabilistic seismic hazard assessment for Ba Ria - Vung Tau Based on recent researches on tectonic and seismic activities in the southern part of Central Vietnam, seismic hazard assessment for Ba Ria - Vung Tau is done by probabilistic approach. The results show that, at the returned period of 475 years, the PGA on rock site range from 0.0...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 646 | Lượt tải: 0
Tần số góc và kích thước phá huỷ động đất trận động đất Điện BiênCorner frequency and rupture area of Dienbien earthquake one of the most important parameters of the earthquake source model is the affected area at the source. Generally, this area is determined by observation instruments or by estimation from calculations based on equations related to the released energy such as magnitude. Brune (1970) co...
5 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 715 | Lượt tải: 0
Mô hình dòng điện xích đạo từ số liệu vệ tinh CHAMPThe equatorial electrojet model with champ satellite data The EEJ (Equatorial Electrojet) is a complex current system flowing in the ionospheric E-layer. Its value changes in space and in local time. The magnetic signature of the EEJ overlaps on the recorded magnetic data and the amplitude of the EEJ magnetic signature is very small with res...
10 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 636 | Lượt tải: 0
Khảo sát các vùng nguồn sóng thần có khả năng nguy hiểm tới vùng biển Việt NamInvestigation of tsunami sources, capable affecting to the Vietnamese coast Based on the analysis of tectonic feature and geodynamic characteristics of regional faults systems in the South East Asia, nine capable source zones of generating tsunamis that can be affected to the Vietnamese coast were delineated in the East Vietnam Sea and adjac...
12 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 578 | Lượt tải: 0
Đặc điểm nước dưới đất trong vùng cát ven biển miền Trung Việt nam và định hướng khai thác sử dụngCharacteristic of groundwater in coastal sand area of Central Vietnam and orientation for exploitation and utilization Groundwater in the Quaternary sediment of coastal sand area of central Vietnam is fresh water only on spot that can be exploited for living and socioeconomic development in the area. However, reserve of fresh groundwater is ...
10 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 669 | Lượt tải: 0
Hiện trạng chất lượng trầm tích tầng mặt vùng ven bờ Hải PhòngStatus quality surface sediment in the Hai Phong coastal area had been carried out studying nutrient (NTotal, PTotal, STotal, COrganic), heavy metals (Cu, Pb, Zn, Cd, As, Hg), pesticide ( lindan, aldrin, 4,4-DDD, endrin, 4,4-DDT, diedrin, 4,4-DDE), oil-grease and cyanide. The concentrations of nutrient were included: NTotal was in a ranged 155....
20 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 560 | Lượt tải: 0
