Journal of Water Resources Science and Technology No.49
Create date: 11/24/18

WATER RESOURCES SCIENCE AND TECHNOLOGY JOURNAL
No 49 (Nov/2018
)

Page

Article

Author

Summary

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SCIENCE AND TECHNOLOGY

 

 

2

VIỆN KHOA HỌC THỦY LỢI MIỀN NAM 40NĂM XÂY DỰNG VÀ PHÁT TRIỂN (19/8/1978 - 19/8/2018)

Hoang, Tran Ba
SIWRR

 

 

 

 

15

ĐÁNH GIÁ BIẾN ĐỘNG MỰC NƯỚC VÀ NGẬP LỤT VÙNG HẠ DU SÔNG SÀI GÒN DƯỚI TÁC ĐỘNG CỦA ĐÔ THỊ HÓA, XÂY DỰNG CÔNG TRÌNH CHỐNG NGẬP VÀ XẢ LŨ CÁC HỒ CHỨA NƯỚC THƯỢNG LƯU

Quynh, Nguyen Phu
Hai, Do Dac
Lam, Do Hong

Truong, Tran Van
SIWRR

 

Flooding in Saigon – Dongnai river downstream is caused by 3 main factors: rain, flood and tide. The problem is exacerbated by inadequate drainage capacity, low-lying terrain, subsidence, spatial planning, inappropriate policies and regulations, lack of awareness and involvement of community. With the application of numerical modelling, the authors present the research results of hydraulic calculations, thereof assessing the fluctuation of water level and inundation in downstream area under the influence of urbanization, preventing flood structures and discharge from upstream reservoirs in each group of specific scenarios. The findings show the causes of inundation, thereby proposing appropriate solutions to prevent flooding and minimize flood risk.

27

ĐÁNH GIÁ TÁC ĐỘNG CỦA ĐÔ THỊ HÓA, XÂY DỰNG CÔNG TRÌNH CHỐNG NGẬP ĐẾN XÂM NHẬP MẶN VÙNG HẠ DU SÔNG ĐỒNG NAI - SÀI GÒN

Hai, Do Dac
SIWRR

 

 

The hydraulic regime and salinity intrusion in the dry season at the lower Dongnai – Saigon river are mainly impacted by tide current from East Sea through Soai Rap and Long Tau estuaries. Currently, the urbannization has been occured severely in the whole downstream areas combining with the construction of tide control works for the urban Ho Chi Minh city that causes affect to hydraulic regime, flood, water quality in the lower areas in there salinity intrusion is one problem. In this paper, we have introduce initial results to assess the impacts of urbanization, tide control works construction to the salinity intrusion in the lower Dong Nai- Saigon River areas.

Keywords: Dongnai-Saigon river, downstream Dongnai-Saigon river, length of salinity intrusion, salty concentration, salinity intrusion, tidal control works, urbanization

36

ĐÁNH GIÁ SỰ THAY ĐỔI SỨC TẢI LŨ TRÊN SÔNG SÀI GÒN

San, Dinh Cong
Duong, Nguyen Binh
SIWRR

The aim of this article is to summarize the result of evaluation the flow transport capacity of the Sai Gon River using historical data, topographical survey and results from numerical models (MIKE11) in the state-level scientific research project KC08.07/16-20 "Research and propose solutions to improve water use efficiency, ensure the safety of main works and downstream Dau Tieng reservoir in the conditions of climate change and extreme weather ".

The comparisons of water levels and flow discharges correspondingly along the Saigon River showed that the flow transport capacity of the Saigon River increased in the upstream part and decreased in the downstream part. Specifically, at the cross-section of Dau Tieng station, with the flood water level of 6.0 m, the discharges in 1984 was only 650 m3/s, in 2005 reached 1,300 m3/s and reached 2,200 m3/s by 2017, ie increased up to 47 m3/year, equivalent to about 7.2% per year. Along the Saigon River the flow transport capacity increased from Km 0 (the dam site) to Km 100. Conversely, the flow transport capacity of the Saigon River is reduced from about Km100 to downstream.

The increase in flow transport capacity on the Saigon River at the upstream part is mainly due to changes in topography. River beds tend to be deeper due to the impact of post-dam construction erosion, or it may be due to sand mining that made river bed lowering from upstream sections to Km100. In contrast, from Km100 downstream, the river bed tends to accret, and in addition, possibly due to due to encroachment (urbanization), or by dike embankments leading to the narrow cross sections, making flow transport capacity reduced.

45

MỘT SỐ VẤN ĐỀ VỀ AN TOÀN HỆ THỐNG CÔNG TRÌNH KÈ Ở ĐỒNG BẰNG SÔNG CỬU LONG

Hue, Doan Van
Thanh, To Van
SIWRR
Nguyen Huu Bao
TLU

Incidents and damages happened to embankment structures caused by the channel flow changes, channel morphological erosion, excessive loading, inadequate structural safety design,... that have been occurred more frequently in recent times (especially in the Mekong Delta) require more complex research to assess the safety of river embankments serving structural renovation, upgrading and new design. This article presents some issues of embankment safety in the Mekong Delta as a basis for the study of the river embankment structure safety determination for any design method.

53

KẾT QUẢ TÍNH SÓNG, NƯỚC DÂNG DO BÃO
VÙNG VEN BIỂN ĐÔNG ĐỒNG BẰNG SÔNG CỬU LONG

Chuong, Le Thanh
Khang, Nguyen Duy
Hung, Le Manh
SIWRR

 

This paper presents the results of wave and storm surges by mathematical modeling method. The multiple scale models used including (model 1D - Mike 11, model 2D - MIKE21/3 Coupled). The data of Linda Hurricane (1997) were used for this simulation, the orbital track of the hurricane has shifted to create the extreme storm surges and wave height for the Eastern Coast of Bac Lieu and Ca Mau province. The results of this simulation are very important for natural disaster mitigation in order to have plans and proactive measures to prevent damage in the Eastern Coast Vietnam.

Keywords: 1D/2Dmathematical model, wave height, sea level rise by storm, the orbital of storm.

63

HẠ THẤP LÒNG DẪN VÀ NHỮNG TÁC ĐỘNG CỦA NÓ ĐẾN HỆ THỐNG SÔNG CỬU LONG

Hung, Nguyen Nghia
Quan, Quan Le
SIWRR
Thanh, Nguyen Cong
HCMUS

Confront informing that river bed degradation and its impacts to river gradients will strongly impact to hydrodynamics regime and its river morphology in the Mekong Delta. This study elaborates and contributes for that message, it show that overload sand mining, upstream damming will strongly impact to stability of the Mekong Delta. From our two key approaches: 1) historical bed topography analysis; and 2) water level analysis, the results show trend of bed degradation from up to 3m/yr (Sa Dec in the period 2014÷2017) and low tide water level is reduced about 3÷10mm/yr at different locations. This impact counterpart with rate of land subsidence, sea level rise will push Mekong Delta into tidal stronger influenced which might will causes tidal flooding, higher flow velocity in canal system, stronger salinity intrusion, limitation of self –irrigate in higher regions and self-drainage for lower regions.

Key words: river bed degradation, lowering water level, tide, Mekong Delta

71

NGHIÊN CỨU QUÁ TRÌNH VẬN CHUYỂN BÙN CÁT VÙNG CỬA SÔNG VEN BIỂN ĐỒNG BẰNG SÔNG CỬU LONG SỬ DỤNG
MÔ HÌNH TOÁN 3 CHIỀU DELFT 3D

Tu, Le Xuan
SIWRR

 

 

This paper presents sediment dynamics in the Mekong estuaries and coastal zone using the Delft3D-4 modeling system. The results show that the Mekong and Bassac River provide a large amount of sediment (more than 90%) that is deposited in front of the mouths due to coastal processes in the flood season. The sediment transport along the coast changes with the monsoon and is dominantly south-west directed during the north-east monsoon, especially in November, December and January.

Keywords:Sediment transport, estuary, coastal zone, Mekong delta

83

PHÂN TÍCH ẢNH HƯỞNG CỦA ĐỘ MẶN, SÓNG GIÓ ĐẾN QUÁ TRÌNH VẬN CHUYỂN BÙN CÁT KHU VỰC CỬA SÔNG VEN BIỂN ĐỒNG BẰNG SÔNG CỬU LONG

Tu, Le Xuan
Hoang, Tran Ba
Chuong, Le Thanh
SIWRR

 

 

The results show the sensitivity analysis the effect of wind, wave and salinity on suspended sediment transport by Delft 3D in estuarine and coastal Mekong delta. The salinity influence significantly on suspended sediment transport and deposition at estuaries. However, the wave and wind effects play a crucial role in resuspended and transport sediment in shallow coastal water, a net longshore of suspended sediment transport towards the south-west is dominant than the north-eastward.

Keywords: Salinity, wave, wind, sediment transport, estuary, coastal zone, Mekong delta

95

NGHIÊN CỨU HIỆU QUẢ GIẢM SÓNG CỦA ĐÊ KẾT CẤU RỖNG TRÊN MÔ HÌNH MÁNG SÓNG

 

Tuan, Thieu Quang
TLU
San, Dinh Cong
Tu, Le Xuan
Duong, Do Van
SIWRR

In this paper presents the result of establishing a new empirical formula of wave transmission at this type of porous breakwater and analysis wave energy spectra transformation before and after this structure in the shallow water base on the 2D physical model experiment in the wave flume.

Keywords: porous breakwater, wave transmission, wave reflection, 2D physical model

103

CỐNG TỰ ĐỘNG VÙNG TRIỀU ĐBSCL THEO YÊU CẦU NGHỊ QUYẾT 120 CỦA CHÍNH PHỦ, TÁI CƠ CẤU NGÀNH NÔNG NGHIỆP VÀ BIẾN ĐỔI KHI HẬU

Hai, Nguyen Thanh
Thang, Tang Duc
SIWRR

Hung, Vu Viet
MARD

 

 

The article presents an overview of automatic tidal sluices in the Mekong Delta during the 2000s and earlier. It also introduces preliminary research results for tidal sluices which is followed requirements of Resolution 120 of the Government, Restructuring of Agriculture and Climate Change.

Keywords:Hydraulic structure, automatic tidal sluice gate, hydraulic regime, Mekong Delta.

110

NGHIÊN CỨU ĐỘNG THÁI ẨM CỦA ĐẤT TRONG KỸ THUẬT TƯỚI NHỎ GIỌT PHỤC VỤ TƯỚI TIẾT KIỆM NƯỚC HỢP LÝ CHO
CÂY TRỒNG CẠN VÙNG KHAN HIẾM NƯỚC (VÙNG KHÔ HẠN)

Hung, Tran Thai
Tri, Vo Khac
Sam, Le
SIWRR

 

 

During the experimental research on a suitable irrigation schedule of drip irrigation technique for Grape leaves at the water scarce region of Binh Thuan province, the author has concurrently experimented on soil moisture dynamic at two places: (1) Natural land (non crops) and (2) Cultivated one with Grape leaves in three crop seasons with 3 irrigation frequencies: 2days (CK2), 3days (CK3) and 4days (CK4). This article was presented at the Natural land. The observed results showed that: at the end of the irrigation frequency, water content of CK2 was larger than suitable min one for crops (θp), water content of CK3 (above layers) and the whole CK4 decreased lower than (θp), it sometimes approached the moisture at wilting point (θwp). The day water content decreased more greately than the evening and night ones, and the afternoon one decreased more greately than the morning one. The water content decrease was the greatest during 9:00÷15:00, the next ones were in period’s 15:00÷21:00, 3:00÷9:00 and the lowest one was in 21:00÷3:00 of the next morning. Establishing the equation system of homogeneous regression between pF and water content in each layer with all verificative results are satisfied and conformable. Therefore, based on these results, this equation system of homogeneous regression can be used to determine suitable water saving irrigation schedule following each development stage schedule for dry crops at the water scarce region (Droughty region) in the South Central part of Vietnam.

Keywords: Drip irrigation, dry crops, irrigation frequency, regression, soil moisture.

123

KIỂM KÊ VÀ DỰ BÁO NGUỒN NƯỚC TRÊN LƯU VỰC SÔNG LŨY - SÔNG LA NGÀ VÀ PHỤ CẬN PHỤC VỤ SẢN XUẤTNÔNG NGHIỆP
VÀ ỨNG PHÓ VỚI HẠN HÁN TRÊN ĐỊA BÀN TỈNH BÌNH THUẬN

Vuong, Nguyen Dinh
Tuan, Tran Minh
Tuyen, Huynh Ngoc
Thinh, Le Van
SIWRR

 

 

 

This paper presents the primary research results on the calculation and forecast of water sources in the river basins that serve agricultural production in response to drought, in-depth research study on forecasting water sources to direct the management of water supply for agricultural production in Dong Xuan crop of 2017-2018 on the Luy and La Nga river basins belonging to Binh Thuan province. The results provide the current status of water sources in the irrigation system, forecasts of water sources, flows to reservoirs and irrigation dams of the last months of 2017 and early 2018,  planning about water use for agricultural production that is appropriate to the conditions of the water source and water supply capacity for agricultural production in Dong Xuan crop of 2017-2018 in Binh Thuan province for the direction, administration and prevention of drought.

Keywords:Water resources forcasting,water balance, drought, river basins

134

ĐỀ XUẤT CÔNG CỤ QUẢN LÝ NGUỒN NƯỚC PHỤC VỤ HỖ TRỢ RA QUYẾT ĐỊNH CHO CẤP NƯỚC SẢN XUẤT NÔNG NGHIỆP
NHẰM ỨNG PHÓ VỚI HẠN HÁN VÙNG NAM TRUNG BỘ

Sam, Le
Vuong, Nguyen Dinh
SIWRR
Duong, Ha Hai
IWE

 

 

The annual precipitation in the Southern Central Region is unevenly distributed over time and space, so drought and severe water shortage usually occurs in dry season almost every year. In the last three  years 2014 - 2016, due to El-Nino phenomenon, which directly affected the Southern Central Region, servere  precipitation and high rising temperature causing drought and water shortage have resulted in extreme damage to production and people's lives. As prolonged drought along with water stored in the irrigation system does not meet the water irrigation amount for agricultural production, many areas of rice land have been stoppedinproduction; the areas of ​​other crops have been lacked of irrigation water at mid and late seasons. This paper presentsthetools for water resources management for supporting decision-making on water supply for agricultural production that actively contributes to prevent drought in the Southern Central Region. The tools are mainly focused on remote sensing data to calculate and monitor water resources for production planning as well as actively responding to droughts in the area.

Key words: Drought, water resources management tools, decision-making support, agricultural production, Southern Central

143

PHÂN LOẠI CÁC MẠCH LỘ VÀ ĐỀ XUẤT MÔ HÌNH THU GOM KHAI THÁC NGUỒN NƯỚC MẠCH LỘ VÙNG KHAN HIẾM NƯỚC KHU VỰC TÂY NGUYÊN

Vinh, Pham The
Luan, Nguyen Dang
Huong, Tran Thi Thu
VAWR

 

 

The paper presents the current state of the spring and the classification of spring. Through the application of modelling in combination with collecting groundwater technology to propose various models of sustainable water harvesting from spring for Ethnic minorities and communities in water scarcity area.

Keywords:spring, water stations, collection, ethnic, highland, water scarcity.

152

XÁC ĐỊNH MÔ ĐUN BIẾN DẠNG DỠ TẢI VÀ THAM SỐ MŨ (m) CỦA ĐẤT YẾU TP. HCM TRONG MÔ HÌNH HARDENING SOIL

Trung, Ngo Duc
Van Hien University

Phan, Vo

HCMUT

Thanh, Tran Thi
SIWRR

This article identifies the modulus of deformation and the dependence of the modulus of deformation on the stress state of HCMC’s soft soil. Parameters were defined as hardness parameters: E50 and Eur in triaxial drainage test. Triaxial compression testing was performed for very soft clay at depths of 4-6 m and 12-14 m, soft clay in the range of 18-20 m and 24-26 m according to drainage conditions with unloading and reloading.

Key words:deep excavation; soil model; stiffness parameters; hardening soil model; oedometer test; triaxial test;

163

GIỚI THIỆU PHẦN MỀM WCANAL INTRODUCTION TO WCANAL SOFTWARE

Tong, Tran
SIWRR

 

The Wcanal software can run well on Win7 (Ultimate 32bit or 64bit) with an intuitive interface. The Wcanal software can support graphics and canal design calculations, such as:

Draw a cross section and longitudinal profile of the terrain;

Draw the designed cross and longitudinal sections and finished work drawings for canals, dykes and dams;

Calculate the soil volume of excavation, filling up, dredging and weathered soil removing in canal design;

Calculating the soil volume of construction excavation and the completed work volume of the corresponding parts have been designed;

Updated terrain survey data, design parameters from Microsoft Excel files (* .xls);

Modify terrain data or channel design parameters directly on the screen;

Printable the drawings with A4 or A3 sizes and publishable into *.bdf files;

Publishable the drawings into Autocad files (*.dwg).

Keywords:Wcanal, canal design software

169

BIẾN ĐỘNG NGUỒN NƯỚC MÙA LŨ HÀNG NĂM DO ẢNH HƯỞNG CỦA CÁC HỒ ĐẬP THƯỢNG LƯU VÀ DIẾN BIẾN LŨ NĂM 2018
Ở ĐỒNG BẰNG SÔNG CỬU LONG

Toan, To Quang
Tuan, Tran Minh
SIWRR

 

 

The Mekong Delta of Vietnam is affected by floods from the Mekong River Basin with the annual flood prone area varies from 1-2 million ha, the flood peak at Tan Chau- the upstream station in Vietnam - varies from 2.4-5.1m. Big floods (flood peak >4.5m at Tan Chau) often cause much damage for agricultural production, infrastructure, people and properties. Beside, floods may also bring a lot of benefits to the Delta such as alluvial sediment to fertile the soils, fisheries resources, water quality improvement and soil reclamation. The existing crops like Winter-Spring and Summer –Autumn rice crop evaded from the flooding period to avoid the damage due to flood and exploit the advantage of floods. The hydropower developments at the upstream of Mekong River were caused and will cause large change to the flood condition in the delta. This paper presented the change of annual flood due to the upstream hydropower development scenarios and an illustrated of the real flood in 2018 to ensure the confidence of the analyzed results.

Keywords: Mekong Delta; Flood; Water resources; Change of cropping pattern; Land use

177

NGHIÊN CỨU SỰ LAN TRUYỀN CÁC NGUỒN NƯỚC MANG MẦM BỆNH TRONG  CÁC HỆ THỐNG THỦY LỢI PHỤC VỤ NUÔI TRỒNG THỦY SẢN
 

Thang, Tang Duc
Vuong, Nguyen Dinh
Trung, Vu Quang
Giap, Pham Van
Phong, Nguyen Duc
Hai, Nguyen Thanh
SIWRR

Aquaculture disease spread along water course (canals, rivers) is one of bigest problems to aquaculture cultivation. Up to now, there is no method to assess this problem. In late 1990’s, a new theory named “The transport of water source components in a canal and river system” presented a wide range of applications. The theory is able to compute volume concentration of a water source at any location and any time. According to this theory, the estimation of aquaculture disease transport can be solved through computing the transport of water source containing disease germ. This paper will show a method to estimate the transport of  aquaculture disease based on the aforementioned theory

186

XÂY DỰNG MÔ HÌNH TOÁN PHỤC VỤ CHO VIỆC DỰ BÁO CHẤT LƯỢNG NƯỚC VÙNG BÁN ĐẢO CÀ MAU

Thang, Tang Duc
Trung, Vu Quang

Giap, Pham Van
Hai, Nguyen Thanh
Toan, To Quang
Hoat, Nguyen Van
SIWRR

Aquaculture, especially shrimp, has been strongly developed in Ca Mau peninsula. However, water quality for aquaculture has been faced with many problems, in which water quality forecast is one of critical issues. This limitation results from not having a model to calculate hydraulics and water quality. This paper will outline the process of building up a model for assessing water quality in the study area based on MIKE11 software. The model demonstrates the capacity in modelling the essential hydtraulics and water quality parameters, and has high applicability

 

 

 

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