Journal of Water Resources Science and Technology No.32
Create date: 04/28/16


WATER RESOURCES SCIENCE AND TECHNOLOGY JOURNAL
No 32 (Apr/2016)

No

Article

Author

Summary

I

SCIENCE TECHNOLOGY

 

 

1

MỘT SỐ GIẢI PHÁP CÔNG NGHỆ NHẰM NÂNG CAO HIỆU QUẢ QUẢN LÝ, KHAI THÁC, SỬ DỤNG TÀI NGUYÊN NƯỚC VÙNG TÂY NGUYÊN

 

Hoa, Tran Dinh

Bang, Nguyen  Thanh

 

Central Highlands, with strengths in forestry is not yet match the region, in addition to this land, there are many other great economic potential anymore, including many specialized areas of industrial crops valuable rare high export (coffee, pepper and rubber). The most important issues affecting the economic exploitation of the potential of the Central Highlands is the creation and management of water resources, efficient use of water resources. The article introduces some irrigation technology solutions serving sustainable development areas, including: creation water sources technology, the use of savings, rational water and effective management water.

2

GIẢI PHÁP CÔNG NGHỆ GIA CƯỜNG KẾT CẤU BÊ TÔNG CỐT THÉP BẰNG VẬT LIỆU CỐT SỢI TỔNG HỢP

 

Cong, Nguyen Thanh

Thanh, Nguyen Chi

 

Using Fiber Reinforced Polymer (FRP) plates to cover the surface of reinforced concrete structures is one of the various strengthening methods, which can recover and also make the load-bearing of structures stronger to adapt the new requirement of exploitation. This paper introduces some important points of the method and also presents results of experimental analysises of reinforced concrete elements strengthed with FRP plates and effectiveness of this method for repairing conduit.

3

PHÂN CẤP QUẢN LÝ, KHAI THÁC CÔNG TRÌNH THỦY LỢI VÙNG ĐỒNG BẰNG SÔNG CỬU LONG:  MỘT TIẾP CẬN DỰA TRÊN NHẬN THỨC CẤP CỘNG ĐỒNG

Viet, Nguyen Duc

Tinh, Nguyen Van

Chinh, Le Van

Decentralize the management and exploitation of irrigation works is necessary to clearly define the roles and responsibilities between the State sector and Private sector; which is also a basis for promoting socialization of irrigation works. However, with the existing types of decentralization such as type of works, size of works, complexity of works, administrative boundaries or irrigated area is quite rigid and inappropriate to apply to specific regions as the Mekong Delta, irrigation is mainly distributed by gravity over large-scale systems and without border. The paper introduce a new methodological approach, towards "bottom-up", based on the community-level awareness to implement decentralize the management and exploitation of irrigation works. Principle is community-level awareness (as the Private sector) to where, the roles of the State to get there, which is appropriate to the market mechanism in agriculture production used irrigation services in the Mekong Delta.

4

TÁC ĐỘNG CỦA HỆ THỐNG HỒ CHỨA THƯỢNG NGUỒN ĐẾN SỰ
BIẾN ĐỔI CHẾ ĐỘ THUỶ VĂN, THUỶ LỰC VÀ LÒNG DẪN HẠ DU

Giap, Nguyen Dang

This paper introduces the analysis results measured data in the hydrological stations on the river upstream Thao, Da, Lo River in 1972-1986 and periods 1987-2010. The same time, analysis of the results observed terrain in the years 2000-2009-2012. The analysis results showed large variation of hydrological regime and downstream bed after the upstream reservoir system start in operation

5

THÚC ĐẨY KHU VỰC TƯ NHÂN THAM GIA HOẠT ĐỘNG CẤP NƯỚC SINH HOẠT NÔNG THÔN

Loi, Doan The

Anh, Nguyen Tuan

 

After 15 years implementing National target program on rural water supply and environmental sanitation, up to now most rural households have been used hygienic water including villages, hamlets in mountainous, remote areas. According to the report of MARD, at the end of 2015 there are 86% of rural population, 93% of schools and 96% of infirmaries have access to hygienic water source. Among great achievements, having the important contribution of private sector, a lot of good models with the participation of private sector in rural water supply occur in provinces such as: Thai Binh, Ha Nam, Long An, Dong Thap, Tien Giang, An Giang, Bac Giang, Bac Ninh, Hung Yen, Hai Duong, etc. The report introduces results of  assessment research on actual operation, sustainability, motivation, trends and barriers of private sector in rural water supply at 3 provinces: Thai Binh, Ha Nam and Long An and proposes solutions to promote the development of  private sector.

6

NGHIÊN CỨU MỘT SỐ ĐẶC TRƯNG CƠ LÝ CỦA VẬT LIỆU HỖN HỢP ASPHALT TRONG GIA CỐ ĐÊ BIỂN

Bang, Nguyen Thanh

The physical and mechanical characteristics of the asphalt material is important input parameters in calculating the structural sea dike revetment. In this paper, the authors introduce the research results basic attributes serve structural design calculations including kinematic stiffness, deformation and residual fatigue properties of asphalt material.

7

ỨNG DỤNG CÔNG NGHỆ QUẢN LÝ NƯỚC TIẾT KIỆM TRÊN RUỘNG LÚA VÙNG ĐBSH; KẾT QUẢ NGHIÊN CỨU VỤ CHIÊM XUÂN 2015 TẠI XÃ PHÚ THỊNH, HUYỆN KIM ĐỘNG, TỈNH HƯNG YÊN

Quang, Le Xuan

Water saving in paddy rice field is not only concerned about water saving in practices, reduce greenhouse gas emission, stronger plant, but also the considering technology effectiveness to the yield of crop, and always became the main targets of manager and farmer on paddy rice cultivation.

This article aims to introduce the initial results obtained from a model that’s developed by the cooperation of Institute for Water and Environment, Kyoto University and Kitai Seikei Japanese Company on paddy field water saving technology. Results showed that the amount of water use is different from irrigation regime testing methods. The volumes of water used in the dried method was 2.496 m3/ha, in half dry method was 2825 m3/ha and 3108 m3 water was used per hectare in reference (traditional cultivation); and the crop yield in these methods were 4.25 tones/ha, 4.61 tones/ha and 3.7 tones/ha, respectively. Greenhouse gas emission CH4 gas accounted 155.71 kg/ha/crop in the dry method, in the half dry method CH4 gas measured 207.99 kg/ha/crop; and 225.27 kg/ha/crop in reference method, Meanwhile N20gas achieved from different testing methods of dry, half dry and reference are: 0.425 kg/ha, 1.23 kg/ha and 2.142 kg/ha per crop, respectively

 

8

ĐỘ SAI SỐ MÔ HÌNH PHẦN TỬ HỮU HẠN LAN TRUYỀN MẶN TRONG NƯỚC DƯỚI ĐẤT TRONG KHÔNG GIAN MỘT CHIỀU SỬ DỤNG PHẦN TỬ TUYẾN TÍNH CỦA MỘT SỐ BÀI TOÁN CHUẨN

 

Hoang, Nguyen Van

Cong, Nguyen Thanh

 

The paper presents results obtained by analytical and finite element modeling (FEM) using linear shape function of some one-dimensional problems and assessment of the errors. It has been found that: (1) For the the boundary of constant concentration of pollutantor saline, the closer to the boundary, the smaller the error is: the relative error does not exceed 0.06% and decreases very small value, less than 0,05%; (2) For the boundary between the polluted and unpolluted groundwater, the error values are greater at the initial period of speeding process, and gradually decrease as time passes; (3) The absolute error and relative error are not of the same trend (i.e. absolute error is great while relative error is less and vice versa) may be present at the areas having either high or low concentration. From the study results some proposals for selection of proper boudaries to reduce error some recommedations of the evaluation FEM methods has been made: either absolute or relative FEM concentration errors should be well associated with the requirement of the actual problems (for heavily toxic substances, it should be used the relative error, and for the non-toxic substances such as salinity absolute error should be used).

9

NGHIÊN CỨU ẢNH HƯỞNG CỦA DÒNG THẤM VÒNG ĐẾN HIỆU QUẢ KỸ THUẬT CỦA TƯỜNG CHỐNG THẤM TRONG MÔ HÌNH BÀI TOÁN THẤM 3 D

Truong, Bui Van

Reseach impact of the seepage arround to effectiveness of cut-off wall analyned by 3D seepage model.

Analyzing seepage with 2D model does not reflect the development of the seepage arround the cut-off wall, therefore it can not assess the impact of the length of the cut-off wall, which can lead to the risk of failure.This paper presents the results of the analysis and evaluation of cut-off wall performance using 3D seepage model for a specific project, thereby have demonstrated the effectiveness of the cut-off wall not only depends on the depth of the wall but also on important, even determined by the length of the cut-off wall. That contributed to the orientation for the calculation and design work to ensure stability.

10

GẠCH BLOCK LÀM TỪ TÁI CHẾ PHẾ THẢI XÂY DỰNG VÀ RÁC SÂN VƯỜN THEO HƯỚNG THÂN THIỆN VỚI MÔI TRƯỜNG

Lan, Pham Thi Ngoc

Construction waste and yard waste is a serious problem for the environment and society since almost all of them has not been collected properly and disposed in unsafe manner. This does not only cause a material resource wasting, but also spends a lot of money on the treatment. The article introduces the research findings of recycling construction waste and yard waste into the adobe bricks with the rate of the yard waste taking a proportion of 2% at the laboratory scale. The bricks made from the construction and yard wastes having the maximum compressive strength are greater than 30 MPa and the water adsorption is less than 12%. The study results also indicated that the specific density of adobe bricks from waste materials is smaller than that of the one made from the sand and stone. Adobe brick made from the waste are rather durable, smooth surface, resistant to high compressive strength, low water absorption. Moreover, this material has rather low cost, and meeting the technical requirements. Therefore, some kinds of products are produced  for paving the pedestrian path, lining the slope of the open drains or of the urban canals.   Some other factors that affect the product quality such as the decomposition of the yard waste in the bricks, and the abrasion, should be studied further.

Keywords: Construction waste, yard waste, adobe bricks.

11

TÍNH TOÁN TỐI ƯU MẠNG LƯỚI CẤP NƯỚC VÙNG 1 (TP. HCM) BẰNG PHẦN MỀM WATERGEMS

Son, Huynh Thanh

Thang, Nguyen Quoc

The paper presents an application of WaterGEMS software to the optimal calculation for the water supply network in zone 1 of Ho Chi Minh City. The results obtained show that the present network is not optimized for construction costs. From calculation  it can also be seen some drawbacks of WaterGEMS that need to be improved such as the discontinuous distribution  of pipe diameters, which is not suitable  for reality.

12

TÁC ĐỘNG CỦA CÁC VẤN ĐỀ BIẾN ĐỔI KHÍ HẬU ĐẾN TÍNH TOÁN NGUỒN NƯỚC VÀ CÂN BẰNG NƯỚC VÙNG TRUNG DU VÀ MIỀN NÚI PHÍA BẮC

Tuan, Nguyen Van

Climate change is increasingly clearly observed, and Vietnam is considered as one of the countries most hit by climate change impacts and extreme weather events. The impacts are particularly more serious in the sensitive and vulnerable regions. The study focuses on analysis the impacts and integration of climate change issues into evaluation of meteorological and hydrological elements as well as effectiveness of water supply structures and water balance to assess the level of water availability to meet the water demands in the Northern Midland and Mountain Region. The study results confirmed the high variability of temperature, rainfall and water demands, and limitations in water supply capacity of the existing structures on the other hand. Water shortage in some locations is also reflected in water balance results which serve as basis for proposing suitable measures to adapt to climate change and secure people’s production activities. 

Key words: climate change, water supply, water balance, Northern Midland and Mountain Region.

13

ỨNG DỤNG MÔ HÌNH MÁNG SÓNG SỐ ĐỂ NGHIÊN CỨU TƯƠNG TÁC SÓNG – TƯỜNG VÀ DÒNG CHẢY SÓNG TRÀN QUA ĐÊ BIỂN CÓ TƯỜNG ĐỈNH THẤP

Thin, Nguyen Van

 

 

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