VNU Journal of Science: Earth and Environmental Sciences最新文献_第8页

Research on the Vulnerability of the Community to Flood: A Case Study at the Downstream of Gianh River, Quang Binh Province 社区对洪水的脆弱性研究——以广平省建河下游为例

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-08 DOI: 10.25073/2588-1094/vnuees.4846

Nguyen Thi Ha Thanh, Nguyen Ngoc Diep, Nguyen Huu Duy, Dang Dinh Kha, P. Le Tuan, Bui Ngoc Tu

{"title":"Research on the Vulnerability of the Community to Flood: A Case Study at the Downstream of Gianh River, Quang Binh Province","authors":"Nguyen Thi Ha Thanh, Nguyen Ngoc Diep, Nguyen Huu Duy, Dang Dinh Kha, P. Le Tuan, Bui Ngoc Tu","doi":"10.25073/2588-1094/vnuees.4846","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4846","url":null,"abstract":"Flood is a frequent natural disaster which has a negative impact on the socio-economic activities of the community in the lower Gianh river area - one of the most vulnerability areas under the flood in the North Central Region, Vietnam. The aim of this paper is to assess the risk of flooding in the study area as well as point out the factors that increase the vulnerability of the local community. The study applies UNESCO-IHE vulnerability approach, combining the flood risk assessment method by MIKE FLOOD model and sociological investigation, with 90 household questionnaires (selected randomly and door-to-door interview). The main results include flood risk level maps (by analyzing inundation depth and flood flow velocities); data on community resilience to flood (resilience capacity and local people's perceptions on flood risks). These results are the basis for not only raising awareness about flood risks but also propose non-structural flood protection solutions for managers and local communities in the research areas. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"30 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133678954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Preliminary Results of Modelling Simulation for High-resolution Hydrodynamic Fields for Central Vietnam's Water 越南中部水域高分辨率水动力场模拟的初步结果

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-08 DOI: 10.25073/2588-1094/vnuees.4691

Dang Dinh Duc, Nguyen Xuan Loc, Nguyen Kim Cuong, Tran Thi Ngoc Anh

{"title":"Preliminary Results of Modelling Simulation for High-resolution Hydrodynamic Fields for Central Vietnam's Water","authors":"Dang Dinh Duc, Nguyen Xuan Loc, Nguyen Kim Cuong, Tran Thi Ngoc Anh","doi":"10.25073/2588-1094/vnuees.4691","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4691","url":null,"abstract":"This paper presents the development of hydrodynamic simulation models (waves, currents) for the Vietnam East Sea and nestingto coastal area (applied in the coastal area of Phu Yen province). The COAWST modeling system has been used. This is an open source system which supports optimal parallel calculation and allows solving large-scale simulation problems. The model has been calibrated and verified by deep water wave data at the stations of Bach Long Vi, Con Co, Phu Quy and Phu Quoc for good results. Along with that, with the goal of having high resolution for the central Vietnam water, the model has been set up with coastal wave data in Phu Yen for very good results, the correlation coefficient between calculation and measurement is up to 0.95. The results of the current field, surface temperature from the model of the ocean shows the similarity with the verification data, especially simulating the typical rising water phenomenon in Ninh Thuan - Binh Thuan area. However, some stages have complicated movements, the model has not been closely simulated, for example in the area of Phu Quy island. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130910531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of Flooding in the Ky Lo River Basin, Phu Yen Province Under the Impacts of Climate Change and Sea Level Rise 气候变化和海平面上升影响下富颜省基洛河流域洪水模拟

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-08 DOI: 10.25073/2588-1094/vnuees.4695

Nguyen Bach Tung, Dang Dinh Duc, Tran Thi Ngoc Anh, Tran Thanh Tung

引用次数: 0

Investigation of Shoreline Changes in the Coast of Haiphong Province from 1987 to 2018 1987 - 2018年海防省海岸岸线变化调查

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-04 DOI: 10.25073/2588-1094/vnuees.4690

Pham Thi Huong, C. Nguyen, Dinh Van Uu

引用次数: 0

Trend Analysis of Rainfall in the Phu Quoc Island 富国岛雨量趋势分析

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-04 DOI: 10.25073/2588-1094/vnuees.4683

Nguyen Tri Quang Hung, Le Xuan Hien

引用次数: 0

Field Investigation of Face Spall in Moderate Strength Coal Seam at Vang Danh Coal Mine, Vietnam 越南Vang Danh煤矿中强度煤层工作面剥落的现场调查

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-06-27 DOI: 10.25073/2588-1094/vnuees.4639

Le Tien Dung, Dao Hong Quang

{"title":"Field Investigation of Face Spall in Moderate Strength Coal Seam at Vang Danh Coal Mine, Vietnam","authors":"Le Tien Dung, Dao Hong Quang","doi":"10.25073/2588-1094/vnuees.4639","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4639","url":null,"abstract":"Face spall in moderate strength coal seam occurs less frequently but can be more severe and takes a longer time to remedy compared to face spall in the weak coal seam. This paper presents a field investigation of face spall in moderate strength coal seam at Face I-8-1, Vang Danh coal mine, Quang Ninh coal field, Vietnam. The leg pressure of shield support and face condition were monitored within two months, and on-site remedial measures to the spall were discussed. The monitoring results confirmed that the front and rear leg pressure profiles are consistent with world-wide observations. The coal face condition in actual operation was found to be more stable than that in project design. The face spall occurred along face dip direction, but mostly in small extent of less than 0.5 m deep and during transitional time between working shifts. Proper ground control near gate ends by using higher capacity shield supports and supplemental hydraulic props was identified to improve face stability in the area. On-site remedial measures proved their efficiency in small to moderate face spall extent. For main roof rupture-associated face spall, technical measures have been applied but they need further investigation to clarify their effectiveness. The paper’s results can be consulted to improve longwall face stability control in similar coal seam conditions. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116221777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tectonic Structure and Relationship with Sinkhole Harzard in Bang Lung Area, Cho Don District, Bac Kan Province 北坎省曹敦地区邦隆地区构造构造及其与天坑灾害的关系

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-06-27 DOI: 10.25073/2588-1094/vnuees.4620

B. Thom, T. Cuong, L. H. Phong, T. Hieu, N. Anh

{"title":"Tectonic Structure and Relationship with Sinkhole Harzard in Bang Lung Area, Cho Don District, Bac Kan Province","authors":"B. Thom, T. Cuong, L. H. Phong, T. Hieu, N. Anh","doi":"10.25073/2588-1094/vnuees.4620","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4620","url":null,"abstract":"By integration of remote sensing images analysis, geology, geomorphology, hydrogeology, geophysical method, and drilling data, the paper illustrates the structure tectonics, causes, and initial mechanism of a sinkhole forming in Bang Lung, Cho Don, Bac Kan province. The NE-SW normal slip faults are an essential fault system in the area, which created Bang Lung graben valley. This fault system also forms large fracture zones, creating advantage conditions for the groundwater runoff both vertically and horizontally to eroded and dissolved carbonate rock-forming underground karst caves. These are favorable natural conditions for forming a sinkhole. The sinkhole hazard in the Bang Lung area is initiated by some main factors such as tectonic activity, thickness, and characteristics of unconsolidated sediment layers, groundwater fluctuation, karst caves, and human activities. The most human impacts are mining exploitation and agricultural cultivation that promote sinkholes occurring faster and earlier. The horizontal and vertical movement of groundwater dragged the material on the ceiling karst caves into ground spaces. Thereby, weakening the cohesion of the unconsolidated sediment above caves leads to gravitational unbalance and creates a sinkhole. This study has also shown potential sinkhole areas in Bang Lung, which helps the authorities and local people in sinkhole prevention and mitigation mission. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130985538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of Ground Subsidence by Sentinel-1 SAR Data (2018-2020) over Binh Duong Quarries, Vietnam 利用Sentinel-1 SAR数据确定越南平阳采石场地面沉降(2018-2020

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-06-27 DOI: 10.25073/2588-1094/vnuees.4605

N. Long, T. V. Anh, Bui Khac Luyen

引用次数: 1

Environmental Factors Influencing Chlorophyll-a Concentration in Tri An Reservoir, Vietnam 影响越南三安水库叶绿素-a浓度的环境因子

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-06-26 DOI: 10.25073/2588-1094/vnuees.4535

Tran Thi Hoang Yen, Tran Thanh Thai, N. V. Tu, N. X. Quang, P. Lưu

{"title":"Environmental Factors Influencing Chlorophyll-a Concentration in Tri An Reservoir, Vietnam","authors":"Tran Thi Hoang Yen, Tran Thanh Thai, N. V. Tu, N. X. Quang, P. Lưu","doi":"10.25073/2588-1094/vnuees.4535","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4535","url":null,"abstract":"Chlorophyll-a (Chl-a) has been used extensively as an essential indicator of trophic state in the assessment and monitoring of surface water quality environments. The environmental factors can influence Chl-a concentrations; thus, to determine the relationship between Chl-a concentration and factors. The research was carried out in dry season (March 2016) and wet season (September 2016) in Tri An reservoir, Dong Nai Province, Vietnam and performed by Spearman's correlation analysis and Linear regression analysis. The result showed that Chl-a varied between 12.84 and 783.51 µg/L and was quite different a cross stations in two surveys. Factor analysis and the best models revealed the association of strong physico-chemical with Chl-a concentration. The Chl-a was significantly positively correlated with Total Suspended Solids (TSS) and negative with Nitrate (NO3-) in the dry season, while in the wet season the positive relationships between Chl-a concentration and Dissolved Oxygen (DO), Temperature and a strong negatively correlated with Phosphate (PO43-) correlation were found. This relationships inferred that the nutrients brought by the influx of reservoir into the study area have contributed to control the growth and abundance of phytoplankton. Thus, the importance of environmental factors in structuring Chl-a concentration may be used to guide the conservation of the aquatic ecosystems in the reservoir.","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121647659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Tectonic Stress Distribution in the Song Tranh 2 Hydropower Reservoir: Implication for Induced Earthquake 宋川2号水电站库区构造应力分布及其诱发地震意义

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-06-26 DOI: 10.25073/2588-1094/vnuees.4558

L. T. Hoài, Pham Nguyen Ha Vu, N. D. Nguyen, Hoàng Thị Thu Thảo, N. Vuong

{"title":"Tectonic Stress Distribution in the Song Tranh 2 Hydropower Reservoir: Implication for Induced Earthquake","authors":"L. T. Hoài, Pham Nguyen Ha Vu, N. D. Nguyen, Hoàng Thị Thu Thảo, N. Vuong","doi":"10.25073/2588-1094/vnuees.4558","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4558","url":null,"abstract":"The Song Tranh 2 hydropower reservoir was built in Tra My area, Quang Nam province, composing magmatic and high-grade metamorphic rocks of the northern part of the Kon Tum massif. Since the reservoir was put into operation, induced earthquakes have occurred in the Song Tranh 2 hydropower reservoir and its vicinity. Tectonically, the northwest-southeast to east-west striking faults developed strongly. Detailed analysis of slickensides and attitude of faults occurring in the studied area have shown that the northwest-southeast striking faults are reactivated as dextral ones during the Pliocene-Quaternary up to the present day. Based on the geometric distribution of the fault network, kinematic characteristics, and the youngest tectonic stress regime, we computed the distribution of tectonic stress in the studied area. Computation results show two positive anomalies of stress directly related to the northwest-southeast faults numbered 2, 10, 11a, 11b and sub-latitude striking fault numbered 1. These faults run in line with the local river channels and are likely to reactivate and generate induced earthquakes. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128514436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3