VNU Journal of Science: Earth and Environmental Sciences最新文献_第7页

Objective Criteria to Determine the Rainy Season Onset Date for the Central Highlands and Southern Vietnam 目的确定越南中部高地和南部雨季开始日期的标准

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-03-24 DOI: 10.25073/2588-1094/vnuees.4772

Pham Thanh Hà, Phan Van Tan

引用次数: 0

Combination of UAV Images and DSM for Land Cover Classification using Convolutional Neural Network 基于卷积神经网络的无人机图像与DSM相结合土地覆盖分类

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-03-24 DOI: 10.25073/2588-1094/vnuees.4812

Bui Quang Thanh, Vu Van Long, Nguyen Xuan Linh, Phan Van Manh

引用次数: 1

Some Sedimentary Environment Characteristics in the Mong Cai Coastal Area, Quang Ninh Province, Vietnam 越南广宁省芒彩沿海地区沉积环境特征

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-03-24 DOI: 10.25073/2588-1094/vnuees.4748

B. Loan, Nguyen Huy Hoang, Nguyen Mai Luu, Le Van Nam, Pham Tien Dung, Nguyen Dac Ve, Le Nhu Sieu, Dang Hoai Nhon, Tran Duc Thanh

{"title":"Some Sedimentary Environment Characteristics in the Mong Cai Coastal Area, Quang Ninh Province, Vietnam","authors":"B. Loan, Nguyen Huy Hoang, Nguyen Mai Luu, Le Van Nam, Pham Tien Dung, Nguyen Dac Ve, Le Nhu Sieu, Dang Hoai Nhon, Tran Duc Thanh","doi":"10.25073/2588-1094/vnuees.4748","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4748","url":null,"abstract":"The sedimentary environment characteristics in Mong Cai coastal area were assessed through pH, Eh, grain sizes, 226Ra, 210Pb, S‰, DO parameters. Mong Cai coastal area is mostly influenced by Ka Long river system that makes changes in the salinity, pH of water, pH and Eh of sediment, grain sizes, and sedimentation rates in the coastal area. There were six sediment types in the coastal area which were coarse sand, medium sand, fine sand, very fine sand, very coarse silt, and coarse silt. Fine sand was common in surface sediments; very fine sand was dominant in sediment core at Ka Long river mount; coarse silt and very coarse silt were common in sediment core at Mui Ngoc. The average sedimentation rate at the Ka Long river mouth (0.72 cm/year) was higher than that at the Mui Ngoc (0.27 cm/year). The sedimentary environment was divided into 3 groups, the first group was marine characteristics higher than the terrigenous characteristic, the second group was terrigenous characteristics higher than marine characteristics, and the third group was marine characteristics. In sediment cores showed 3 stages. In stage 1, distribution fine sand, very fine sand, and very coarse silt, from 52 to 80 cm at the Ka Long river mouth and from 40 to 52 cm at the Mui Ngoc. In stage 2, distribution of very coarse silt, coarse silt, from 38 to 52 cm (1947 - 1877) at Ka Long river mouth with sedimentation rate from 0.08 to 0.31 cm/year, at the Mui Ngoc from 12 to 40 cm (1944 (12 -14 cm)) with sedimentation rate of 0.09 cm/year. In stage 3, distribution very coarse silt, very fine sand, fine sand, from 0 to 38 cm (1919 - 1961) at the Ka Long river mouth with sedimentation rate of 0.34 - 1.62 cm/year, at the Mui Ngoc from 0 to 12 cm (2019 – 1966) with sedimentation rate of 0.07 - 0.51 cm/year. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"266 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117105230","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

Assessment of Groundwater Quality in the Holocene Aquifer in Duy Tien District, Ha Nam Province using Groundwater Quality Index (GWQI) 基于GWQI的河南杜天地区全新世含水层地下水质量评价

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-03-24 DOI: 10.25073/2588-1094/vnuees.4781

Trinh Thi Tham, Do Thi Hien, Nguyen Thuy Chung, Ngo Tra Mai

引用次数: 0

Application of the TITAN Software for Forecasting the Thunderstorm Over Mid-Central Region of Vietnam TITAN软件在越南中央区雷暴预报中的应用

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-03-23 DOI: 10.25073/2588-1094/vnuees.4696

Nguyen Thi Dung, Nguyen Tien Toan, Cong Thanh

引用次数: 1

Application of Decision Tree Model in Mass Land Valuation: A Case Study in Vung Tau City 决策树模型在大规模土地估价中的应用——以云头市为例

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2022-03-23 DOI: 10.25073/2588-1094/vnuees.4588

Nguyen Huu Cuong

{"title":"Application of Decision Tree Model in Mass Land Valuation: A Case Study in Vung Tau City","authors":"Nguyen Huu Cuong","doi":"10.25073/2588-1094/vnuees.4588","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4588","url":null,"abstract":"Land valuation is one of many important tasks in land use and management. In order to be objective and scientific in land valuation, it is necessary to identify factors affecting land price and quantify the relationship between land feature factors and land value. The goal of the study is to apply the decision-tree regression model to build mass land pricing models in Vung Tau city. The decision-tree regression model is applied in land valuation by determining the relationship between a combination of land feature factors and corresponding averaged land price. Research on building the land pricing model with independent variables includes business density, area, road types, business activities and road width based on 883 survey samples. The final result of this tree model was categorized into 51 divided groups, and pruned trees included 15 divided groups. The importance of the independent variables, namely, business density, region, road level, business activities and road width are 100%, 83.48%, 78.87%, 58.78% and 10.03% respectively. The interpretation rate of the independent variables to the formation of land price model is 86%. The decision-tree regression model suggests another approach to land valuation theory. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121187542","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

Evaluation of Processes Affecting the Variation of Groundwater Quality in Quang Nam, Da Nang, Vietnam 影响越南广南、岘港地下水水质变化的过程评价

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-08 DOI: 10.25073/2588-1094/vnuees.4693

Phan Nam Long, Nguyen Thi Ngoc Anh, Bui Van The Vinh, Can Thu Van, N.T. Thu Thao, Huynh Thi Thu Thuy

{"title":"Evaluation of Processes Affecting the Variation of Groundwater Quality in Quang Nam, Da Nang, Vietnam","authors":"Phan Nam Long, Nguyen Thi Ngoc Anh, Bui Van The Vinh, Can Thu Van, N.T. Thu Thao, Huynh Thi Thu Thuy","doi":"10.25073/2588-1094/vnuees.4693","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4693","url":null,"abstract":"Groundwater quality is vulnerable to various processes. In this study, processes affecting groundwater quality were evaluated in coastal aquifers of Quang Nam - Da Nang (QNDN). A chemical data of 426 groundwater samples from 27 monitoring wells in the period 2011-2018 were analyzed. Principal Components Analysis (PCA) and Base Exchange Indices (BEXD) were applied for the evaluation. The PCA results suggested the influences of natural processes and anthropogenic activities on the groundwater quality. Seawater influence contributed to the dominant ions in groundwater; mineral weathering and dissolution mainly increased the alkalinity, Ca2+, and Mg2+; SO42- reduction explained the low SO42- in the groundwater; and reductive dissolution of Fe (hydroxides) caused Fe exceeding WHO’s drinking standard. Intensive groundwater abstraction generated up coning of saline groundwater; discharge from agricultural practices, industrialization, and urbanization were considered as sources of high NO3- in groundwater. The integration of monitoring data and BEXD gave a better interpretation of salinization and freshening, which can be masked by the memory effects of seawater transgression and regression in history. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"27 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":"127926413","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

Assessment of Do Son Beach Changes using Monitoring Camera Images 利用监控摄像机图像评估斗山海滩的变化

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-08 DOI: 10.25073/2588-1094/vnuees.4692

Vu Cong Huu, Dinh Van Uu

引用次数: 0

Constructing Rapid Refresh System for Rainfall Nowcasting (0-6 h) at the Ho Chi Minh City 胡志明市降水临近预报(0-6 h)快速更新系统建设

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-08 DOI: 10.25073/2588-1094/vnuees.4694

Truong Ba Kien, Vu Van Thang, Tran DuyThuc, Nguyen Quang Trung, Pham Xuan Quan

{"title":"Constructing Rapid Refresh System for Rainfall Nowcasting (0-6 h) at the Ho Chi Minh City","authors":"Truong Ba Kien, Vu Van Thang, Tran DuyThuc, Nguyen Quang Trung, Pham Xuan Quan","doi":"10.25073/2588-1094/vnuees.4694","DOIUrl":"https://doi.org/10.25073/2588-1094/vnuees.4694","url":null,"abstract":"This study presents an hourly updated assimilation and model forecast system (Rapid Refresh - RAP) designed for rainfall nowcasting at Ho Chi Minh city (named HCM-RAP). The HCM-RAP implemented the Weather Research and Forecasting (WRF) model, driven by Global Forecast System (GFS) data at horizontal resolution of 0.25x0.25 degree, in combination with rapid update of radar data at Nha Be station. The HCM-RAP is evaluated during the heavy rainfall event of 25-26 November 2018 against observation data at 10 stations. Results show the advantage of data assimilation in the improvement of hourly rainfall forecast, in compared with the forecast from the experiment without assimilated data. However, the rainfall forecast amount was still underestimated by the HCM-RAP. This is the first attempt for heavy rainfall forecasting and warning for Ho Chi Minh city. In order to implementing the HCM-RAP for operational forecast, further study is recommended, for instance, more heavy rainfall events and in merger with quantitative precipitation estimation from radar and satellite data. \u0000 ","PeriodicalId":247618,"journal":{"name":"VNU Journal of Science: Earth and Environmental Sciences","volume":"6 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":"115194715","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

Assessment of Wetland Ecosystem Services in Tien Yen Estuary, Quang Ninh Province 广宁省天严河口湿地生态系统服务功能评价

VNU Journal of Science: Earth and Environmental Sciences Pub Date : 2021-12-08 DOI: 10.25073/2588-1094/vnuees.4811

Nguyen Thi Dieu Linh, Dang Kinh Bac, Vu Thi Phuong, Truong Quang Hai, Hoang Thi Thu Huong

引用次数: 1