realtime operation of reservoir system in flooding season on vu gia thu bon rivers

Purpose of the research Dissertation research model building operating systems in real-time reservoir flood season and the period of application for reservoir system on the Vu Gia - Thu

INTRODUCTION

1 The necessity of the research

On river system Vu Gia - Thu Bon they have been building a lots of hydro-reservoirs, and this will affect the flooding control of these reservoirs The process of reservoir contain the fixed activities, lack

of method warning and forecasting flood actions Besides, the realtime operation of reservoirs is applied less, especially in Centre of Vietnam So, the research on realtime operation which has the warning and forecasting model is neccessary and meanful in science and practice This not only for the reservoirs in Vu Gia- Thu Bon but also for others in the Centre Therefore, I suggest the PhD thesis

"Realtime operation of reservoir system in flooding season on Vu Gia Thu Bon rivers"

2 Purpose of the research

Dissertation research model building operating systems in real-time reservoir flood season and the period of application for reservoir system on the Vu Gia - Thu Bon to improve efficiency and reduce flood impacts do not cause positive for downstream areas, while still ensuring generating purpose

3 Tasks of the research

(1) Analysis, problem setup reservoir system operation in real time (2) The study built a model of warning, flood forecasting system of reservoirs on the Vu Gia-Thu Bon system operator serving

(3) Dissertation research model building operating systems in time reservoir flood season and the period of application for reservoir system on the Vu Gia - Thu Bon to improve efficiency and reduce flood impacts do not cause positive for downstream areas, while still ensuring generating purpose

real-(4) Evaluate usability in actual operation of reservoirs on the Vu Thu Bon river and applicability to other reservoir systems of the

Gia-central region

4 Research methods

(1) Methods of analysis, synthesis

(2) Method of forming causal analysis

(3) Methods of system analysis

(4) Methods inherited

5 Theoretical and practical significance of the research

Theoretical significance: Thesis will contribute to the development of the field of operation of irrigation systems in Vietnam, as well as contribute to a solution for the development of the field of water

resources development in the world

Practical significance: thesis oriented technical solutions The specific objective of this project is to create a program capable of calculating support decision-making in the operation and flood control reservoir system As the scientific basis for the addition of operating procedures and also had a form of case studies can be considered applicable to other river basins of the central region Simulation model that authors can build application for flood forecasting and safe operation of flood control reservoirs on the Vu

Gia-Thu Bon

6 Scientific Approach

(1) On the basis of theoretical models, build a simulation model from the rain and flood forecasting system operator for the upstream reservoirs The model is connected to the downstream region is simulated by MIKE 11 models available The model calculates the flood is linked simulations in real-time systems

(2) On the basis of the model is established considering operation scenarios reservoir system to overcome the limitations of operating procedures issued reservoir due to limited flood forecasting

(3) Develop a process to operate in real time in order to improve the efficiency of flood relief, flood discharge safely secure and store water for generating purpose and downstream water supply

7 New findings of the research

(1) Establish a program to calculate the simulation model (MOPHONG - LU) integrated three models : model rain flow, reservoir operation model and computing lu river to the uplands in

Vu Gia - Thu Bon serve for flood forecasting with time scheduled from 3 to 5 days as the basis for determining the reservoir operating mode in real time

(2) For the first time the method of construction of reservoir operation in real time to the reservoir system on the Vu Gia - Thu Bon flood period fully capable in practical applications

(3) On the basis of studying the operational plan for flood control reservoir system , has proposed raising the capacity of flood control and flood prevention capacity operating modes appropriate to improve efficiency for flood relief downstream , is the basis for

additional reservoir processes approved

CHAPTER 1: OVERVIEW OF RESEARCH ON REALTIME

OPERATING SYSTEM RESERVOIR

1.1 Overview of domestic Research

Reservoir operation system is one of the issues that many research institutions interested in research on practical applications of the reservoir system in our country

1.2 Overview of international Research

The problem of operating the system in real time is a very complex problem, because the reservoir system has its own characteristics, so

no program can completely solve this problem

3 The software to calculate the flood in river systems

4 Application of simulation models for system operation problem of reservoir flood season scenarios reservoir system operation'' reasonable'' to satisfactorily resolve the conflict between generating

purpose and lowering flood level

CHAPTER 2 SCIENTIFIC AND PRACTICAL BASE OF ESTABLISHING THE REALTIME RESERVOIR OPERATION PROBLEM DURING THE FLOOD SEASON FOR RESERVOIR SYSTEM ON VU GIA-THU

BON RIVERS

2.1 Flood Characteristics formation on Vu Gia-Thu Bon

2.1.1 Geographical location: Basin located Coordinates 16o03'- 14o55' north latitude; 107o15 '- 108o24' East longitude

2.1.2 Topographic features: In general topography of the basin varies so complex and fragmented Topography people tend to tilt from West to East

2.1.3 Features rivers

Vu Gia - Thu Bon river's length and slope of the river to prevent large

2.1.4 Formation characteristics of flood in the river system

2.1.4.1 Characteristics rain causes flooding

Heavy rainfall combined with steep terrain is the main cause of floods in Quang Nam

2.1.2.2 Characteristics flood mode

Quang Nam has the most terrain is hilly to steep country the ability to focus quickly

2.2 Reservoir system and the task of regulating reservoir system

2.2.1 Flood control reservoir system on the Vu Gia - Thu Bon river

Mainstream Vu Gia - Thu

Bon and will have built large

reservoirs 5 reservoirs is

responsible for downstream

flood relief : A Vuong , Song

Tranh 2 and Song Bung 2

and Song Bung 4 and Dakmi

4

2.2.2 Tasks and processes regulating reservoir operation flood period

Designing tasks of 5 reservoirs are defined as follows:

- Water supply for downstream dry season period with a total volume

of about 273.9 million m3 moderator

- Power generation capacity has been designed in accordance with the hydro plants are listed in the table above

- Cut flooding downstream with the flood of applications with frequencies ranging from 5 % to 10 % , equivalent to major floods

Note: (*): imcome flood water level suggested by author

2.3 Methodological basis for reservoir operation in real time

2.3.1 The concept of reservoir operation in real time

Reservoir operating in real time is a method which determines the operation at a certain time depending on the state of the system at that time and forecasted information in the next paragraph Decision operator = F ( + System Status forecast results)

2.3.2 The main contents of operating system problems in real-time reservoir

Perform an operational processes in real time to any reservoir system

include:

( 1 ) data collection system ;

( 2 ) banking data storage and data management systems ;

( 3 ) analysis of program results ;

( 4 ) the program flow forecasts in real time ;

( 5 ) simulation program activities reservoir system

2.3.3 Description and operating principle reservoir flood control systems in real time

Calculate the forecast rain and flood forecasting and reservoir buttons

to enter the river catchment

* Simulation model with inputs including

* Decision operating system according to the calculation results of the simulation model

Operation flood control reservoir system with rain forecast for 3-5 days , the time period between the forecast and update operational decisions is operational decision Δt at any time is to follow the steps follows :

Figure 2.2 Schematic diagram between the components of system operation problem

- Step 1 : At any time during the operational phase , carried out on the basin precipitation forecasts

- Step 2 : Calculate the flow forecasting process water to enter the save button and the corresponding rain forecast

- Step 3 : Analyze system status

- Step 4 : Calculate movements determine the reservoir water level and water flow of the flood-control button on the system

Step 5 : Decide a reasonable plan to operate the system

Decision will be adjusted to operate continuously at the next moment during system operation

2.3.4 Scientific basis and practical problem setup real-time operation for flood control reservoir system on the Vu Gia - Thu Bon river

Problem operated reservoir flood control systems based on the following grounds :

(1) The requirements and the need to establish operational problem of reservoir flood control systems in real time

(2) The ability to forecast rain caused flooding and flood forecasting and reservoir buttons to enter saved the whole system

(3) The ability to choose the available models or new models developed in accordance with operational problems posed

2.4 Set math operation and regulation of real time flood period reservoir system on the Vu Gia - Thu Bon

2.4.1 Determine the purpose of research

1 Application method operates in real time period for the reservoir flood season name Vu Gia - Thu Bon

2 Developed a simulation model to serve flood forecasting and reservoir operation flood control reservoir system in real time , testing for Vu Gia - Thu Bon during the flood season

3 Propose to operate reasonable flood control reservoir system 2.4.2 Scope of the Study

2.4.2 Scope of the Study

2.4.2.1 Space research

Includes 5 reservoirs downstream flood control mission , which is the

A Vuong reservoir , Dakmi 4 , Song Tranh 2 , Song Bung 2 and Song Bung 4

2.4.3 Approaching method

1 Construction of flood forecasting models estimated time of 3-5 days and is continuously updated in the forecast period as a result of rain forecast

2 For the upstream sector , construction program "MOPHONG – LU" 3 model by integrating components : flood forecasting model and enter the reservoir flow model and calculate the flood in river simulation models operation of the reservoir For downstream use MIKE 11 model

CHAPTER 3: ESTABLISHING A MODEL FOR

SIMULATION AND FLOOD FORECAST RESERVOIR SYSTEM REALTIME OPERATING UNDER REAL- TIME SYSTEM FOR RESERVOIR IN VU GIA-THUBON 3.1 Overview of the model application in reservoir management and operational orientation in dissertation research

3.1.1 Introduction of the management model of reservoir operation

The RIBASIM model , MIKE - BASIN been widely applied in preparing the planning and management of water resources for a river basin but no application in reservoir operation system MIKE 11 model type model suitable for operational flood forecasting and flood control reservoir system However, the model applies to applications for operational problems reservoir flood control systems still need to write the command to operate the floodgates and also very complex

3.1.2 Summary of simulation modeling applications in reservoir operation system in real time

Currently there are two models tend to simulate applications in reservoir operation system :

1 Tend to use models available

2 Development of models to suit the problem reservoir system operation over time

3 Comment: It is difficult to model applications are available to operate the math reservoir flood control systems in real time Today 's commercial development trends 2

3.1.3 Orientation of the thesis research

Based on these observations , the authors study the construction of a generalized simulation model ( MOPHONG - LU ) problem serving operate flood control reservoir system The model will be applied on the Vu Gia - Thu Bon river and assess applicability to other watersheds have similar conditions

3.2 Building simulation models calculate the flood on the river system management MOPHONG_LU use in reservoir flood control operation

3.2.1 The model structure

Similar to the model , the model that the authors MOPHONG - LU also build structures of block simulation

( 1 ) module of basin settings :

( 3 ) module of the simulation :

( 2 ) network module of the lake:

3.2.2 Selection of model components in the model MOPHONG - LU

3.2.2.1 Selection methods calculate the flood flow to the lake and enter the save button

In this study we chose two calculation methods : Method street SCS synthetic unit and calculation method according to the NAM model 3.2.2.2 Selection methods calculate the flooding river network

Computing flow for each river segment is modeled Muskingum method

3.2.2.3 Computing flow through the reservoir

Flow through the outlet discharge is calculated by the water balance equation solver à discharge capacity through the discharge process 3.2.2.4 Integrated simulation model

The integration is the model in a simulation model : the enter button

to store this description will enter button connected to any river system ; each river are described sequence with the paragraph above and below paragraphs how ( a river can be connected with many river above it , also similar to the reservoir node

3.2.3 Programming model calculations for MOPHONG - LU

The program built computational algorithm based on the link between the component model and the river was named MOPHONG

- LU

3.2.3.1 Algorithms and computer programs for modeling

Calculation program written in FORTRAN 77 includes main program and five subroutines

a Enter the program calculates flow along the SCS unit

b The program calculates flow entering the model NAM

c Computer program through the reservoir flood

Here is the program interface on the screen when setting the initial operating plan:

write(*,'(A\)')' DO MO (PHAN TRAM %):'

WRITE(*,'(A\)')' SO THOI DOAN TINH TOAN

3.2.4 Application MOPHONG - LU model for Vu Gia - Thu Bon

MOPHONG - LU model is applied to the upstream Vu Gia - Thu Bon Application content includes 2 models : ( 1 ) Determine the model parameters and ( 2 ) application in reservoir operation in real time

3.2.4.1 System Characteristics Vu Gia - Thu Bon river

Vu Gia - Thu Bon

and Vu Gia River

Nong Son and the

hotel to the river

mouth , while large

floods floodwaters

flowed over a wide

area of the

downstream river basins

3.2.4.2 Characteristics of the target network , hydrological

On the Vu Gia - Thu Bon 18 rain gauges , flow measuring stations 2 and 6 water stations

3.2.4.3 Flood control reservoir system

System Vu Gia - Thu Bon has 5 large reservoirs to regulate flood control on the Vu Gia four reservoirs in which there are two types of serial clock is the Song Bung 2 and Song Bung 4 , two lakes and

Figure 3.11 Map grid meteorological stations and hydrological as planned (Source: Water Resources Management Department - Ministry of Natural