Journal of Water Resources Science and Technology No.31
Create date: 02/26/16


WATER RESOURCES SCIENCE AND TECHNOLOGY JOURNAL
No 31 (Feb/2016)

 
No
Article Author Summary
I SCIENCE TECHNOLOGY    
1 LIQUID MUD IN SOAI RAP WATER BED AND TREATMENT SOLUTION

Ass.Prof. San, Dinh Cong

Eng. Hiep, Nguyen Van

Ass.Prof. Hung, Le Manh

Dr. Thuyen, Le Xuan

During carrying out the research project of HCM city "Scientific research related to the project on navigation channel training, assessment of deposition after dredging" - under the project of Soai Rap Channel Dredging (phase 2), conducted by Southern Institute of Water resourcecs Researh (SIWRR), the  newly unknown "liquid mud" was found deposited in the Soai Rap channel after dredging upon the designed elevation, which could threaten navigation safety. Therefore an additional study was procceded to solve the issue. The SIWRR  co-ordinated with a research group from Natural Science University of HCM city, sampled and determined the density of "liquid mud" with depth. At the same time, based on the study of "liquid mud" deposition phenomenon on navigational channels and regulations related to navigation safety and to density of “liquid mud” in the world, the authors proposed short term solution on the appropriate application of densityof “liquid mud” in order to avoid wastage of handling it on Soai Rap navigation channel.
2 IMPACT ANALYSIS OF UPSTREAM RESERVOIRS TO HYDROLOGICAL CHANGE OF DRY SEASON FLOW IN MEKONG DELTA

Dr. Toan, To Quang

Prof. Thang, Tang Duc
 

The Mekong Delta of Vietnam plays an important role in the economy in general and strategy for food security of Vietnam in particular, it contributes 50% of the national food product and more than 90% of annual exported rice product. The Mekong Delta of Viet Nam is located at most downstream of the Mekong River, therefore the change of flow to the delta due to upstream development may affect to the sustainable development on the delta. Based on the analyzedresultsof historical data of Mekong River flow  from 1924 to 2015, the change of the dry season flow and the impact of the reservoirs in regulating the flow in recent years have been clarified, this contributes to better understand the water resources condition in the delta and contribute to improve the efficiency of water management on the plains.
3 RESEARCH ASPHALT MIXED MATERIALS FILLED IN ROCK MASONRY LAYER FOR REPARATION OF SEA DIKE SLOPE PROTECTION IN HAI THINH COMMUNE – HAI HAU DISTRICT NAM DINH PROVINCE Dr. Bang, Nguyen Thanh This paper presents results of  grouting mortar mixture composition ratio ditermination used for repairing Hai Thinh sea dike revetment. Test results of main mechanical and physical technical of grouting mortar are met requirments.
4 ADDITIONAL ARTIFICIAL PROVISION FOR UNDERGROUND WATER FROM SPILLED EXCEED WATER OF SMALL AND MEDIUM RESERVOIRS IN CENTRAL HIGHLANDS

Dr. Thanh, Dang Hoang

Eng. Vuong, Nguyen Huy

The paper propose the sotutions for increase reserves of groundwater by the artificial  projects. Recharge source used the water volume on medium rise level of small and medium - sized reservoirs in Central highlands. The test results at Ea Kring reservoir show that, the layers in bazan could receive approximately 168,3 – 219 m3/day/well.
5 CASE STUDY ON MODEL FOR SELF-FINANCIAL BUSINESS IN MANAGEMENT OF RURAL WATER SUPPLY WORKS IN TRA VINH PROVINCE Dr. Hanh, Dang Ngoc Tra Vinh is one of the best provinces on development of the effective, sustainable management and operation model for Rural water supply systems after construction. At the moment, the model of provincial center for rural water supply & sanitation in Tra Vinh is one of fully independent public service units. Its revenue from rural water supply service in 2012; 2013 and 2014 is 26,12; 35,23; and 41,20 bill.VND relatively. Curently it is providing services for more than 70.000 rural households, depreciation of annual fixed assets is around 6-7 bill.VND. This is significant figures which can be rarely obtained by the other provinces in the country at present. From this case study, the author recommended some mechanics and policies to improve efficiencies of operation and management of publish water supply in the future.
6 STUDY ON THE APPLICATION OF GLASS FIBER REINFORCED CONCRETE IN IRRIGATION SYSTEMS IN COASTAL AREA
 

Dr. Cong, Nguyen Thanh

Ass.Prof. Uyen, Hoang Pho

Reinforced concrete structures of marine hydraulic constructions are subject to (out of the effects from loads, waves, abrasion due to continuous changes in dry and wet conditions) potential damages by steel corrosion. When the steels are in contact with sea water, they are corrosive by ion chlorine, enlarging the size of the steel bars and then causing damages to the concrete. This paper introduces research results on application of glass fiber reinforced concrete in marine hydraulic constructions instead of using conventional steel reinforced concrete to increase the service life of the structures.
7 STUDY AND PROPOSE SOLUTION FOR THE STABILITY OF LA GI MOUNTH, DINH RIVER IN BINH THUAN PROVICE

MSc. Vuong, Nguyen Duc

Ass.Prof. Hung, Le Manh

Eng. Phuong, Nguyen Thi

In this paper, the authors have briefed the results of overview, analysis and research on sediment and erosion development at the La Gi – Dinh estuary, Binh thuan province. based on those results, the authors propose training works for stablization of estuaries and coastal zones at the La Gi – Dinh estuary in order to creat good condition for stable development of regional socioeconomy.
8 STUDY FOR THE STABILITY OF RIVER BANK IN TIDE EFFECTED AREA Ass.Prof. Son, Huynh Thanh The paper presents anapplication of the Bank Stability and Toe Erosion Model (BSTEM)  for calculating the stability of  riverbankin tidal zone.The factor of safety in BSTEM is determined with the limit equilibrum method. The water piezometric heads in the Hau riverbank at Binh Duc (Long Xuyen) in the Mekong delta have been realized two times, one in the middle of the rain season and another at the beginning of the dry season. The results obtained with BSTEM are compared with those obtained with SLOPE software, showing that BSTEM gives equivalent results but with a simpler utilisation and it is notably a non-commercialsoftware.
9 DISCUSSION ON SOME MECHANISM FOR WATER SUPPLY IN NORTHERN MOUNTAINOUS AREA IN THE NEXT PHASE Dr, Hanh, Dang Ngoc After around 20 years for implementation of National target program on rural water supply and sanitation (NTP) those have achieved great achievements. The reports of MARD showed there were around 82.5% population of whole country using hygienic water (achieved 100% of target) [1]by the end of 2013. However, the issue here is sustainability of the above results in coming period since the  NTP will not no longer be existing independently after 2015, especially are for people living in the North mountainous region? This article will review the achievement, limitation and propose the soft models to continue the rural water supply development progress in the North mountainous region via local staffs at the district agricultural offices in order to develop the models and self- investment support mechanism for small water supply systems at the household or group of households.scale.
10 DISCUSSION ON SOME MECHANISM FOR WATER SUPPLY IN NORTHERN MOUNTAINOUS AREA IN THE NEXT PHASE

MSc. Cuong, Ho Viet

MSc. Khuong Dao Van

Dr. Bang, Nguyen Thanh

Eng. Bac, Tran Dinh

In fact, physical model has been used as a very effective tool in scientific research, it allows the simulation of dynamic processes of river or estuary area visually and close to reality. Therefore, research methods on physical models are very interested and bring significant benefits in the results of scientific research, through modeling helps to refine design parameters for the work, shorten construction time, save money for the inefficient work item ... This paper presents some experimental results in physical modeling combined wave and tide  pools to study hydrodynamic regime, the diffusion process spread turbidity in coastal areas Đồ Sơn – Hải Phòng and assess the effectiveness of structural measures in reducing turbidity in the area of Đồ Sơn beaches. Since then there are petitions and appropriate solution proposals, which has the highest efficiency to help improve the water quality of beaches in the area.

 

11 STUDY ON UNSTEADY INFILTRATION FLOW THROUGH  RIVER BANKS IN TIDE EFFECTED AREA
 
Ass.Prof. Son, Huynh Thanh The paper presents a mathematical model for unsteady seepage in riverbank in tidal zone. The seepage equation has the form of a heat transfer equation after linearization. The analytical solution obtained by the variable separation method and the numerical solution obtained by the implicit finite difference method. These solutions are then compared with field measurement results at Binh Duc (Long Xuyen) on the Hau riverbank. The analytical solution has a limited precision due to the river boundary condition which must be sinusoidal variation of river water level, but in reality it has the form of an irregular semi-diurnal tide. For the numerical solution, there is a good concordance between  numerical solution and field measurement, due to the input data to the numerical model are exactly the field measurement values.
12 STUDY RESULTS ON DEVELOPING RISK MAP OF BANK SCOUR FOR SE SAN RIVER SECTION IN THE VIETNAM TERRITORY
 
Dr. Quan, Ngo Anh In recent years, the river erosion occurs frequently on Se San river, Kon Tum province. The erosion studies on this river become more importance in this period. However, reservoirs operation, deforestation and climate change are more influence on river erosion. The investigation, observation and monitoring of some importance erosion points are done in this research. Moreover, GIS and remote sensing images will be  used in river change detection application. The series of image Landsat MSS, Landsat TM, Landsat ETM+, SPOT are collected. The river morphology change will be detected base on analyzing series of image from 1973 to 2013. The erosion map is also built in this study.
II TECHNOLOGY TRANSFER    
13 RESULTS OF ASSESSMENT ON CURRENT SITUATION OF OXYGEN DECLINE IN SOME RESERVOIRS OF VIETNAM


 

Shinya Fukuju, Masataka Yamagishi, Takaya Yanobu
Akihiko Nonaka

Hoa, Tran Dinh

Hanh, Trinh Van

Huong, Hoang Thi Thu

The anoxiaphenomenon in the deep layers of the dams/reservoirs inHue Cityhas a huge influence on water quality input for the downstream water plant. This is problematic for a lot of other reservoirs in Vietnam. Currently, this issue has not been addressed in Vietnam. According to the literature review on the dams’s study in Vietnam, the number of dams are at risk of oxygen depletion, is huge. This paper introduces an overview of field observation results phenomenon oxygen depletion in some reservoirs and dams and needs assessment handle the phenomenon of dams in Vietnam

 

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