Water Balance in Irrigation Reservoirs Considering Flood Control and Irrigation Efficiency Variation

Self Cite

Abstract:Simulink, an extension of MATLAB, is a graphics-based model development environment for system modeling and simulation. Simulink's user-friendly features, including block (data process) and arrow (data transfer) objects, a large number of existing blocks, no need to write codes, and a drag and drop interface, provide modelers with an easy development environment. In this study, a Tank model was developed using Simulink and applied to a rainfall-runoff simulation for a study watershed to demonstrate the potential of Simulink as a tool for hydrological analysis. In the example given here, the Tank model was extended by two sub-modules representing evapotranspiration and storage-runoff distribution. In addition, model pre-and post-processing, such as input data preparation and results plotting, was carried out in MATLAB. Moreover, model parameters were calibrated using MATLAB optimization tools without any additional programming for linking the calibration algorithms and the model. The graphical representation utilized in the Simulink version of the Tank model helped us to understand the hydrological interactions described in the model, and the modular structure of the program facilitated the addition of new modules and the modification of existing modules as needed. From the study, we found that Simulink could be a useful and convenient environment for hydrological analysis and model development.

Section: The Tank Modelmentioning

confidence: 99%

Simulink Implementation of a Hydrologic Model: A Tank Model Case Study

Song

Her

Park

et al. 2017

Self Cite

“…The tank model has been widely used in Japan, Korea and many other countries in Asia for flood forecasting, watershed modeling, and reservoir operation from an unmeasured watershed [52]. In the case of the small-sized watershed in South Korea, a modified three-layer tank is widely used when the basin lag time is short and the hydrograph recession slope is steep [53]. …”

Section: Rs(t) = Rs(t − 1) + Ri(t) + Rp(t) − (Int(t) + Rf(t) + Ro(t) mentioning

confidence: 99%

“…In the case of the small-sized watershed in South Korea, a modified three-layer tank is widely used when the basin lag time is short and the hydrograph recession slope is steep [53]. For the present study, the runoff of a watershed was estimated based on the characteristics of reservoirs in South Korea.…”

Section: Reservoir Operation Modelmentioning

confidence: 99%

Regional Climate Change Impacts on Irrigation Vulnerable Season Shifts in Agricultural Water Availability for South Korea

Nam

Kim

Hong

et al. 2017

Abstract:Reservoirs are principal water resources that supply irrigation water to paddy fields and play an important role in water resources management in South Korea. For optimal irrigation reservoir operation and management, it is necessary to determine the duration of irrigation water shortages. Management of reservoir operation and irrigation scheduling should take into consideration essential variables that include the water supply in a reservoir and the water demand in the associated irrigation district. The agricultural water supply and demand show different patterns based on the variability and uncertainty of meteorological and hydrological phenomena. The duration of excessive water supply can be quantitatively determined through analysis of deviations and changes in the timing of agricultural water supply and demand. In this study, we introduce an approach to assess the vulnerable seasons of paddy irrigation to enable more effective operation and management of reservoirs. The vulnerable seasons were evaluated through comparison of the potential water supply capacity and irrigation water requirements based on water budget analysis via a time series change analysis. We have assessed the changing in the total duration and duration shifts of the vulnerable irrigation seasons for four agricultural reservoirs using past observed data from meteorological stations maintained by the Korea Meteorological Administration (KMA) and projected climate change scenarios (2011-2100) as depicted by the Representative Concentration Pathways (RCPs) emission scenarios. For irrigation vulnerable seasons under both the RCP 4.5 and RCP 8.5 scenarios, the results showed periods of significant increases in which total vulnerable seasons compared to the historical period; the longest duration of vulnerability occurred during the 2071-2100 period under the RCP 8.5. Identification of the vulnerable seasons for paddy irrigation can be applied in agricultural water management to more effectively manage reservoir operation during irrigation periods with climate changes.

“…The modules in the TANK component include the modules for watershed land use, parameter determination with land-use-based optimization process, continuous daily runoff, and display. The TANK model has been widely used in rainfall-runoff modeling, owing to its computational and conceptual simplicity and its forecasting accuracy [28][29][30][31][32]. The TANK model component includes optimized modular models and generalized equations for calibrating the model.…”

Section: Basic Element Modulesmentioning

confidence: 99%

“…Using the calibrated model, various reservoir operation scenarios can be evaluated based on water-balance analyses regarding potential water shortage issues and thus local water planning [32]. …”

Section: Performance Evaluation Of the Modeling Systemmentioning

confidence: 99%

Development of a Component-Based Modeling Framework for Agricultural Water-Resource Management

Kang

Srivastava

Song

et al. 2016

Self Cite

Because hydrologic responses of an agricultural watershed are influenced by many natural and man-made factors including pond/reservoir, management practices, and/or irrigation/drainage, strategies of hydrological modeling for the watershed must be case-dependent and thus carefully designed to effectively reflect their roles as critical hydrologic components in simulation processes. In this study, we propose a component-based modeling framework that accommodates a flexible modeling approach to consider a variety of hydrologic processes and management practices, especially irrigation-reservoir operation and paddy-farming practices, in watershed-scale modeling. The objectives of this study are twofold: to develop a COmponent-based Modeling Framework for Agricultural water-Resources Management (COMFARM) using an object-oriented programming technique, and to evaluate its applicability as a modeling tool to predict the responses of an agricultural watershed characterized with diverse land uses in a case study. COMFARM facilitates quick and easy development of watershed-specific hydrologic models by providing multiple interchangeable simulation routines for each hydrologic component considered. COMFARM is developed with the JAVA programming language, using Eclipse software. The framework developed in this study is applied to simulating hydrologic processes of the Seon-Am irrigation-district watershed consisting primarily of reservoir-irrigated rice paddies in South Korea. The application study clearly demonstrates the applicability of the framework as a convenient method to build models for hydrologic simulation of an agricultural watershed. The newly developed modeling framework, COMFARM is expected to serve as a useful tool in watershed management planning by allowing quick development of case-oriented analysis tools and evaluation of management scenarios customized to a specific watershed.