In the karst regions of Vietnam, there are many different terrains. The most important one is karst polje. Because there are a lot of residential areas and important economic regions. Based on the study of Geomorphology, geological structure analysis, Geophysics document analysis, and karstification process research at Lang Son karst polje. The author gives conclusions: Lang Son karst polje was formed from the limestone of Bac Son Formation, 700 – 800 m thick. Lang Son karst polje was formed from anticline structure, the limestone of Bac Son Formation that has high karstification level. Lang Son karst polje has only one karst aquifer which is a water supply source for residential areas in Lang Son city. This karst aquifer distributes in limestone blocks of the Bac Son Formation. Geohazards on Lang Son karst polje include collapse, sinkhole, flood, and pollution of water. Among them, the most dangerous one is the collapse of the underground karst caves.
In recent years, landslides in mountainous provinces are increasing. Whenever the rainy season comes, landslides occur, causing casualties to people and damages to the infrastructure. Son La, a mountainous province in the North of Vietnam, has suffered significant damage from landslides. Therefore, the purpose of this research is to introduce an application of the analytic hierarchy process (AHP) method with the integration of representative concentration pathways (RCP) scenario 4.5 to study landslides in Son La province, Vietnam. With the integration of the digital elevation model (DEM) and collected data into ArcGIS software, we obtained different factor maps: Slope map, Aspect map, Cleavage density map, River density map, Rainfall map, Lithology map, Fault density map, Vegetation cover map, Distance to roads. These were the important input parameters for the AHP method. The data collected from 2009 to the present and the research documents of the authors based on the field investigations in 2018, 2019, 2020, and 2021 were the basis for us to complete this article. The landslide risk maps with the integration of maximum daily rainfall from the climate change scenario for 2025 and 2050 were produced. The results revealed that the landslide risk in Son La province increases with time. The results from this research will assist local authorities in land use planning, disaster control, and achieving sustainable development goals.
Ban Vang area, Kham District, Xieng Khouang province, Laos is interested by many geologists. Remote sensing analytical results have identified some prospective mineral areas. One of them is the Ban Vang area. On that basis, Indochina Mining Joint Venture Company (IMC) cooperated with the Northwest Geological Division (Ministry of Natural Resources and Environment of Vietnam) to conduct mineral exploration in the Ban Vang area. The research results suggest that the Ban Vang area, Kham District, Xieng Khouang province, Laos has 2 iron ore bodies, 3 copper ore bodies, and potential ore outcrops. The Fe content of the iron orebodies varied from 28.5% to 58.7%. The ore-bearing rocks and the adjoining rocks are gray skarns having a solid structure with the main mineral composition of pyroxene and garnet. The copper content of the copper orebodies ranged from 0.14% to 5.59%. Copper ore bodies’ bedding is inclined to the west with a dip angle from 55o to 85o and thickness from 0.7m to 20.59m. The ore-bearing rocks and adjoining rocks are gray metamorphic rocks (skarn) with massive structure, granule, panidiomorphic, and grain textures. The mineral composition is mainly garnet and pyroxene. This article introduces remote sensing applications of mineral search in the Ban Vang area. The mineral search was conducted by the Northwest Geological Division. In this project, the author is a supervisor of the IMC Company.
In recent years, landslides in mountainous provinces are increasing. Whenever the rainy season comes, landslides occur, causing casualties to people and damages to the infrastructure. Son La, a mountainous province in the North of Vietnam, has suffered significant damage from landslides. Therefore, the purpose of this research is to introduce an application of the analytic hierarchy process (AHP) method with the integration of representative concentration pathways (RCP) scenario 4.5 to study landslides in Son La province, Vietnam. With the integration of the digital elevation model (DEM) and collected data into ArcGIS software, we obtained different factor maps: Slope map, Aspect map, Cleavage density map, River density map, Rainfall map, Lithology map, Fault density map, Vegetation cover map, Distance to roads. These were the important input parameters for the AHP method. The data collected from 2009 to the present and the research documents of the authors based on the field investigations in 2018, 2019, 2020, and 2021 were the basis for us to complete this article. The landslide risk maps with the integration of maximum daily rainfall from the climate change scenario for 2025 and 2050 were produced. The results revealed that the landslide risk in Son La province increases with time. The results from this research will assist local authorities in land use planning, disaster control, and achieving sustainable development goals.
The Groundwater Quality of Tay Ninh province was studied applying monitoring of 24 wells from 2016 to 2019. Based on this research there were determined 8 sites with very bad water quality, mostly due to the low pH index, high iron and ammonium contents. The remaining 16 wells preserve very good water quality. To determine the relationship between Groundwater Quality and peat deposits, the authors studied the map of these deposits in Tay Ninh province and compared it with monitoring points. The results show source of pollution mainly related to peat deposits and human activity. Due to the sustainable development, Tay Ninh province needs planning and the reasonable exploitation of the groundwater in the next 30–50 years, as well as the water resources partition and their management in each district.
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