Journal of Water Resources Science and Technology No.39
Create date: 07/28/17

WATER RESOURCES SCIENCE AND TECHNOLOGY JOURNAL
No 39 (July/2017
)

Page Article Author Summary
I SCIENCE TECHNOLOGY    
T2

VẤN ĐỀ  DỰ BÁO DIỄN BIẾN LÒNG DẪN SÔNG HỒNG KHI XÉT ĐẾN KHAI THÁC CÁTTRÊN LÒNG SÔNG

Quynh, Nguyen Ngoc; Thanh, Dang Hoang - VAWR

Calculating and forecasting the riverbed changes in the Red and Thai Binh river systems in natural conditions and considering the general scours due to the construction upstream reservoirs has been carried out for many years. The methodology and calculation skills under these conditions are not too complicated, but the forecasting will become much more complex in the event of the sand mining activity on the river (sand mining sites are widely distributed, capacity and time of exploitation are not uniform).

In order to improve the computational capacity as well as to meet the forecasting requirements under the actual conditions of river management, this article will present some analysis and testing calculation result of  predicting  riverbed changes for   the Red river  taking into account the impact of sand mining over time and space on river channel.

Key words: forcast the riverbed changes; general scour; sand mining
T11

NGHIÊN CỨU ĐỀ XUẤT TIÊU CHÍ QUY HOẠCH THIẾT KẾ CÁNH ĐỒNG LỚN SẢN XUẤT LÚA VÙNG ĐỒNG BẰNG SÔNG HỒNG VÀ ĐỒNG BẰNG SÔNG CỬU LONG

Tuan, Doan Doan - CPIM

Implimentation of large rice field depends on two factors: (1) Field arrangement and construction of infrastrutures and (2) production organization and linkages for rice production and consumpption. The Field arrangement and construction of infrastructures depends on (i) means of farming such as farming machines, (ii) Water management conditions suchs as irrigation and drainage operations, (iii) topographical conditions suchs as the slope and smothness of the land surface, (iv) Social and economic conditions such as the posibility of  farm land colection, unusable land percentage. The production organization and linkages for rice production and consumpption depends on farm size, consencus anf capability among farmers/stakeholders for production and consumption.

The large rice field, in the Red River Delta and Mekong River Delta, considering the factors affecting the field arrangement and production organization and linkages for rice production and consumption, should conform to the following criteria:

The large rice field should be build on the foundation of production organization and linkages for rice production and consumption based upond the contracts between the production groups/cooperative and enterprises buying the rice pproduct. The scale, sizes of the field plot, block and farm block should conform to the current situation of land ownership and to the future of land accumulation. Farm road and irrigation/drainage canal should meet the mechanization, indipendent irrigation and drainage access for each plot for intensive farming

T21

NGHIÊN CỨU THÀNH LẬP BẢN ĐỒ NGẬP LỤT TỪ ẢNH VIỄN THÁM RADAR ÁP DỤNG CHO HẠ DU LƯU VỰC SÔNG TRÀ KHÚC, SÔNG VỆ, TỈNH QUẢNG NGÃI

Luan, Nguyen Thanh; Hung, Nguyen Thanh; Cuong, Vu Dinh; Huyen, Nguyen Thu - IHRCE

Son, Pham Quang - VAST

The impact of floods on society and the natural environment is great, thus building flood maps is very important so that we can actively take measures to mitigate flood damages. Remote sensing data can be used to efficiently create an inundation map. Different flood mapping techniques have been used with data from active radar-sensing sensors such as Sentinel-1, ALOS-PALSAR. The spatial data pairs obtained from Sentinel-1 were processed in this study. Each pair includes an image in the flood time and another image before the flood. Both images in the same area were processed to create a flood map. The flood inundation maps of the downstream of the Tra Khuc River and the Ve River in Quang Ngai Province is studied in this paper using remote sensing technique.
T29

DIỄN BIẾN XÓI LỞ BỜ, SUY THOÁI RỪNG NGẬP MẶN VÀ ĐỊNH HƯỚNG GIẢI PHÁP PHÒNG CHỐNG CHO DẢI VEN BIỂN HẠ DU ĐỒNG BẰNG SÔNG MEKONG

Hoang, Tran Ba; Thanh, Le Thi Phuong - SIWRR The system of mangrove belt and seadike in the Mekong Delta plays an important role in protecting the behind land againts natural disasters from the ocean, increasing sediment deposition along the coast, as well as protecting environment, biodiversity, and biological systems. Unfornately, the mangrove forest in the delta has been seriously degrading in recent decades, even completely disappeared at several area. Coastal erosion has damaged houses, infrastructures (i.e seadike, road, …), properties of people living in the coastal area. By analysing historical data, remote sensing images in several years and also by using numerical and physical models, the change of coastline and the main causes of coastal erosion were carried out, from which the feasible solutions for coastal erosion protection and mangrove forest restoration for the Mekong delta coast were proposed
T39

NGHIÊN CỨU ỨNG DỤNG MẠNG THẦN KINH NHÂN TẠO (ANN) TRONG DỰ BÁO TRƯỚC LƯU LƯỢNG NƯỚC ĐẾN HỒ CHỨA CỬA ĐẠT

Quan, Ngo Van; Thao, Do Phuong - TLU

Thinh, Nguyen Xuan - VAWR

Tien, Nguyen Van - State Audit Office of Viet Nam

Forecast of the water flow to the reservoir has a very important significance in the operation of the reservoir safety and rational distribution of water for the water use needs. Consequently, there have been many studies enhance the reliability of the forecast of the amount of water to serve for the management, operation of the reservoir. Therefore, main objective of study is to apply of artificial neural network (ANN) direct use of reverse propagation algorithm to forecast the water flow to the Của Đạt reservoir before 3 days on the basis of the analysis, assessment for two scenarios: (1) To forecast water flow to reservoir only consider about flow element and (2) consider both of flow and rainfall elements. The results showed that, when considering both of flow and rainfall factors for higher accuracy. In particular, with the data of the Cửa Đạt station is error (RMSE) reduced from 75.04 to 56.35 m3/s m3/s and the index of R2increased from 0.68 up 0.72, with similar error (RMSE), Cam Thủy station also dropped and index R2 increased.This researchresults provide a useful method in forecasting, that is particularly meaningful in the management of water resources and significant contributions in building the reservoir operation management scenarios are more active.

Keywords:ANN, The artificial nerve network, forecasts of water flow
T46

XÂY DỰNG BẢN ĐỒ NGẬP LỤT HẠ DU HỒ CHỨA NƯỚC EAĐRĂNG TỈNH ĐẮK LẮK ỨNG VỚI CÁC KỊCH BẢN XẢ LŨ VÀ ĐÁNH GIÁ THIỆT HẠI DO NGẬP LỤT GÂY RA

Tuan, Hoang Ngoc - CVIWR The safety of reservoir is being hot issue and actually the most necessary issue in Vietnam. In order to ensure the safety of reservoir in unusual weather conditions and changes to the adverse direction, the flood flow is larger than the design flood, flood after flood make the structures in danger of high unsafety. Along with that is the pressure of socio-economic development, theinfrastructure and population living in downstream of reservoir along the river has increased quickly. The case which combining between flood and flood releases from reservoirs will cause a lot of damage to people and property if there does not warning timely.To actively cope with the disaster, we applied HEC-HMS, HEC-RAS model and GIS software so as to forecasting flood and establishing the downstream inundation map for 01 representative construction, Ea Đrăng resevoir - Dak Lak province, to be based on applying for other reservoirs in the central highlands of Vietnam
T54 CÔNG NGHỆ CẤP NƯỚC NUÔI TÔM THẺ TRÊN CÁT Thai, Ha Van; Dong, Pham Van; Nhung, Ngo Thi Phuong - IWE

At present, intensive and ultra-intensive white leg shrimp farming on sandy soil, less water without circulation and with closed circulationhave been strongly developed in the North Central Coast provincesand have brought great economic effects for local people in the region. However, the consequences of environmental pollution are also big issues causing the diseases occur frequently and unsustainable development of the shrimp industry. Water sources to supply for shrimp ponds play a very important role contributing to the success in farming.

The paper provides a method for calculating water demandfor one hectare of white leg shrimp farming on sandy soiland some forms of marine water supply for farming areaswhich have been implemented and tested at Xuan Thanh Aquaculture Farming and Processing Cooperative (Ha Tinh) forthree farmingseasons in 2016 and 2017 with 2 forms of taking water:(1) Taking water directly from the sea; and (2) Taking water through natural sand filter.
T65

NGHIÊN CỨU ĐÁNH GIÁ ĐỘ CỐ KẾT CỦA NỀN ĐẤT YẾU ĐƯỢC
GIA TẢI TRƯỚC KẾT HỢP THOÁT NƯỚC THẲNG ĐỨNG

Truong, Nguyen Hong - VAWR

Thai, Nguyen Huu - TLU

 
T73

XÂY DỰNG PHƯƠNG PHÁP XÁC ĐỊNH DÒNG CHẢY TỐI THIỂU THEO CÁCH TIẾP CẬN TỔNG HỢP CÁC YẾU TỐ THỦY VĂN, THỦY LỰC VÀ SINH THÁI

Dung, Nguyen Thi Kim - IWE

Water is a precious resource that has an important and decisive influence on life as well as the general development of society. Determining the minimum flow (DCTT) for downstream areas to ensure the sustainable economic - social - environmental development is urgent and necessary. In this paper, the author reports a holistic approach to developing a method of determining the DCTT for downstream areas considering the effects of upstream reservoir regulation. Of which, three main factors are deeply analyzed: hydrology, flow dynamics and river ecology. This is a scientific and practical basis for identifying the DCTT for the lower river basin (LVS).

Key words: Minimum flow, Environmental flow, Water basin
T82 ĐỀ XUẤT BỘ TIÊU CHÍ ĐÁNH GIÁ CÔNG TÁC XÂY DỰNG NĂNG LỰC BẢO VỆ MÔI TRƯỜNG, ỨNG PHÓ VỚI BIẾN ĐỔI KHÍ HẬU, THIÊN TAI TẠI CỘNG ĐỒNG DÂN CƯ CẤP LÀNG XÓM THÔN Cuong, Pham Hong - VAWR

Proposing a set of criteria for assessing the capacity of environmental protection and responding to climate change and natural disasters in the village and village communities in the context of global climate change helps localities in self-assessments of capacity to cope with adverse impacts of natural disasters and climate change, as well as help managers understand the current capacity situation of localities. This paper presents the principles for formulation and analysis of indicators and proposing criteria for assessment of environmental protection and response to climate change and natural disasters at the village level

Key words: Climate change, natural disaters, capacity of environmental protection
T90

ĐÁNH GIÁ BIẾN ĐỔI CÁC ĐẶC TRƯNG THỦY VĂN DÒNG CHẢY THIẾT KẾ LƯU VỰC SÔNG PÔ-KÔ TỈNH KON TUM SỬ DỤNG MÔ HÌNH KHÍ HẬU AGCM3.2S

Boonsy Sitthideth, Vannasin Hansackda- Bộ Nông nghiệp và Lâm nghiệp - Cộng hòa Dân chủ Nhân dân Lào

Dang, Nguyen Mai - TLU

Nam, Do Hoai - VAWR

This paper presents the assessment of changes in runoff regime, hydrological features, and design floods at Po-Ko river basin in mid-term (2020-2039) and long-term (2080-2099) climates based on the rainfall projected by a super high-resolution climate model. Results indicate that the hydrological features in the mid-term climate tend to decrease slightly, but design floods are about to increase, relative to the baseline climate (1989-2008). Meanwhile, most hydrological features are projected to increase, especially the design floods in the long-term climate. This is a basis to make informed decisions in adaptation to climate change.

Key words: Climate model AGCM3.2S, super high-resolution, hydrological features, and design floods
T97 XÓI MÒN BỀ MẶT VÀ VẬN CHUYỂN BÙN CÁT TRONG LƯU VỰC SÔNG LÔ Hung, Le Thanh - TLU

This article approaches the problem of surface erosion and sediment load in the Loriver basin, in order to predict the possible impact of reservoirs and land use changes on surface erosion and sediment load in the river basin.The RevisedUniversal Soil Loss Equation (RUSLE), a river network routing scheme, land use change and effects ofreservoirs were accounted in modeling erosion and sediment yield passing from naturalimpounded and land use change conditions.Land use changes scenarios, parameterized on the basis of observed land use changes in theimpounded basin, assuming that 20% of forest area is converted into rice and agriculturalcrops and 15% into bushes, shrubs and meadows show that a 28% increase of sediment loadcan be expected. The Thac Ba reservoir and the Tuyen Quang reservoir already changed sediment concentration since 1971 and 2005 when they were,respectively, in operations. By analyzing the sediment concentrationdata, the sediment load reduction of about 95%isshown for the dam in the Chay river (Thac Ba reservoir)and71%isfor the dam in the Gam river (Tuyen Quangreservoir).

Keywords:Reservoirs, Lo river basin, RUSLE, sediment load, surface erosion

T105

XÂY DỰNG MÔ HÌNH BÁN PHÂN BỐ MÔ PHỎNG DÒNG CHẢY CHO MỘT SỐ LƯU VỰC SÔNG LỚN VÀ VỪA KHU VỰC NAM TRUNG BỘ

Yen, Le Thi Hai; An, Ngo Le - TLU

Rainfall-runoff models are widely applied to simulate flow from rainfall. Lumped parameter models have the advantage of fast calculation with a small amount of input data requirement, but it cannot illustrate the variation of hydro-meteorology features by space, so it is only suitable for small basins. The distributed parameter models provide good description of spatial variation both in the basin responses and hydrological meteorological factors, but they require large amounts of data and longer computational time. This research builds a semi-distributed model combining the advantages of two groups of lumped and distributed parameter models based on the NAM model and the Muskingum routing. The model is applied in order to simulate daily runoff for the medium scale basins (Nong Son, Thanh My) and large scale basin (Cung Son). The Nash coefficient of calibration and verification processes are higher than 0.80, showing the effectiveness and the good applicability of the model.

Keywords: Semi-distributed model, Nam rainfall runoff model, Vu Gia – Thu Bon, Ba, Muskingum routing
T114

SỬ DỤNG THUẬT TOÁN NSGA II TỐI ƯU VẬN HÀNH TRỮ NƯỚC MÙA MƯA SỬ DỤNG CHO MÙA KHÔ TRÊN HỆ THỐNG KÊNH CHÍNH VÙNG 9 XÃ KÊNH LÊ XUÂN ĐÀO, HỆ THỐNG THỦY LỢI NAM NGHỆ AN

An, Nguyen Quang - CPO

Le Xuan Dao canal region includes 9 communes in the South East of Hung Nguyen, Nghe An province with 4.637,6 ha of total area in which 2.475,41 ha agriculture area. This is the delta mainly agricultural production, affected by natural disasters such as floods, droughts, Lao wind, etc. Due to the climate and hydrological characteristics of the area, the annual rainfall is relatively high but it is unevenly distributed, about 85% in rainy season, only 15% in dry season, resulting in excess water in rainy season and water shortage in dry season.

This paper presents the results of applying the NSGA II algorithm to optimize water harvesting in the rainy season to provide sufficient water deficit during the dry season for agricultural production and to reduce the cost of pumping during the rainy season.

Key Words: Le Xuan Dao canal; water harvesting, optimal; NSGA II
T120

NGHIÊN CỨU GIẢI PHÁP CẢI THIỆN TÌNH HÌNH DÒNG CHẢY SAU KHI XÂY DỰNG CÁC CÔNG TRÌNH KÈ VÀ ĐƯỜNG, CHỈNH TRANG ĐÔ THỊ  DỌC BỜ SÔNG CÁI - NHA TRANG

Quyet, Nguyen Kien - UTT

The paper presents the results of study on the countermeasure to improve the flow situation after building of embankments and roads and urban renovations along Cai river bank, Nha Trang city. The results show that after building the embankment constructions,  the roads and around the several islets as Ngoc Thao, Nhat Tri and Ngoc Thao bridge combined with clearance the T0, T1, T2 islet, the highest rise of water level of flood 3%  is about 15 cm; the rise of upstream water level at Duong Sat is about 13 cm; the flow rates into the left creek from Duong Sat to end of Ngoc Thao islet acount for 66,7% (increased 10%) and into the right creek is 33,3%. The river segment from end of the Ngoc Thao islet to the downstream, the flow rate into Xom Bong creek is 81,7% (increased 7,7%) and into Ha Ra creek is 18,3%. Therefore, after clearacing of the T0, T1, T2 islet, the rise of water level due to constructions is decreased and adjusted the flow rate for better flood drainage of the left creek, reduced the negative effects caused by construction, improved the flood drainage of the river segment, improving the landscape and the value of exploitation for the river.

Keywords: Cai river, Duong Sat brigde, Tran Phu brigde, Nhat Tri islet, clearance of the T0, T1, T2 islet
T127

ỨNG DỤNG MÔ HÌNH HỒI QUY LOGISTIC DỰ BÁO ỐNG BỂ TRÊN HỆ THỐNG PHÂN PHỐI NƯỚC

Lanh, Pham Thi Minh - HCMUT

Hai, Pham Ha - UAH

Anh, Vu Thi Van - HCMUNRE

Hang, Truong Thi Thu - TLU

Truong, Nguyen Quang; Hong, Le Dinh - HCMUT

Pipe failure phenomenon often have on water distribution systems, it is not only causes economic losses to water supply companies, but also the risk of  pathogen contaminant intrusion into the pipe. Some models were applied to define probability of pipe failure by statistic data or experimental data, but most models are limited to metal materials, however the number of plastic as UPVC, HDPE is used popular on the network again ignored. In this paper, we propose a logistic regression model to determine the relationship between the likelihood of pipe failure and pipe characteristics on the water distribution systems for all pipe materials. Results of model will be apply for water distribution system in Hai Chau district, Da Nang city.

Keywords: water supply pipe; Logistic Regression Model; water distribution systems; R software

 

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