scholarly journals Improved model for studying hydrological process in the field-to-filed irrigation system

2021 ◽  
Author(s):  
Arash Ebadi ◽  
Omid Raja ◽  
Hamed Ebrahimian ◽  
Mohammad Reza Yazdani ◽  
Vahid Rezaverdinejad
Keyword(s):  
Water Balance ◽  
Water Depth ◽  
Irrigation Efficiency ◽  
Paddy Fields ◽  
Return Flow ◽  
Hydrological Process ◽  
Water Balance Components ◽  
Irrigation Systems ◽  
Return Flows ◽  
Irrigation Return Flow

One of the common irrigation systems in the paddy fields is field-to-field irrigation. The management of these irrigation systems is difficult and essential because of the water scarcity. Estimating the parameters affecting the water balance in paddy fields is necessary by considering the irrigation requirements of downstream fields. The objective of this study is to develop a computational model for calculating the water balance components including the irrigation return flows in paddy fields. The irrigation return flow is considered the main factor of water supply in downstream fields. The developed model is able to calculate the crop evapotranspiration, deep percolation, surface water storage, soil moisture, irrigation return flow, and irrigation efficiency. Field data including the outflow discharge and ponding water depth from the paddy fields during the growing season was used to evaluate the model. Five fields were investigated, which the upstream field was being irrigated continuously, and the return flows were transferred into the downstream fields. The model’s water balance error was about 0.5 %. The Root Mean Square Error (RMSE), Nash-Sutcliffe Efficiency (NSE), and coefficient of determination (R2) for simulation of outflow discharge were 0.124 L/s, 0.827, and 0.893, respectively. These indices were 9.6 mm, 0.884, and 0.909 for simulation of ponding water depth on paddy fields, respectively. The results showed that the model performed well to simulate outflow discharge and ponding water depth. Hence, the management of the water balance components in paddy fields would be much easier through the modelling water flow to increase the irrigation efficiency.

Estimation of Water Balance Components in Paddy Fields under Non-Flooded Irrigation Regimes by using Excel Solver

2012 ◽  
Vol 11 (2) ◽  
pp. 53-59 ◽  
Author(s):  
Chusnul Arif ◽  
Budi Indra Setiawan ◽  
Masaru Mizoguchi ◽  
Ryoichi Doi
Keyword(s):  
Water Balance ◽  
Paddy Fields ◽  
Water Balance Components ◽  
Irrigation Regimes ◽  
Excel Solver

scholarly journals Development of SWAT-PADDY for Simulating Lowland Paddy Fields

2016 ◽  
Author(s):  
Ryota Tsuchiya ◽  
Tasuku Kato ◽  
Jaehak Jeong
Keyword(s):  
Water Balance ◽  
Management Practices ◽  
Swat Model ◽  
Irrigation Management ◽  
Agricultural Watershed ◽  
Paddy Fields ◽  
Balance Model ◽  
Return Flow ◽  
Modified Model ◽  
Paddy Cultivation

The consumption of rice, which recently increases globally, leads to requirement for planning sustainable water management for paddy cultivation. In this research, SWAT model was modified to evaluate sustainability of paddy cultivation. Modifications to simulate paddy cultivation are 1) to equip with a new water balance model of impounded fields, 2) to add an irrigation management option for paddy fields, which is characterized by flood irrigation managed by farmers on a daily basis, 3) to consider puddling operation that influences water quality and infiltration rate of soil. The enhanced model, named SWAT-PADDY, was applied to an agricultural watershed in Japan as a case study. The modified model succeeded in representing paddy cultivation in the study area. However, SWAT-PADDY underestimated base flow in irrigation period. The cause of this is inferred that the modified model doesn’t represent return flow of excess withdrawal of river water. In conclusion, addition of the models of impoundment and management practices in paddy fields to SWAT improved field scale simulation of water balance and irrigation in paddy fields. However, further improvement of the model on irrigation return flow process is needed to better predict hydrology of watersheds dominated by paddy irrigation.

Estimation of irrigation return flow from paddy fields considering the soil moisture

2009 ◽  
Vol 96 (5) ◽  
pp. 875-882 ◽  
Author(s):  
H.K. Kim ◽  
T.I. Jang ◽  
S.J. Im ◽  
S.W. Park
Keyword(s):  
Soil Moisture ◽  
Paddy Fields ◽  
Return Flow ◽  
Irrigation Return Flow

scholarly journals Hydrological evaluation of open-access precipitation data using SWAT at multiple temporal and spatial scales

2020 ◽  
Author(s):  
Jianzhuang Pang ◽  
Huilan Zhang ◽  
Quanxi Xu ◽  
Yujie Wang ◽  
Yunqi Wang ◽  
...  
Keyword(s):  
Open Access ◽  
Water Balance ◽  
Spatial Scales ◽  
Rain Gauge ◽  
Surface Flow ◽  
Base Flow ◽  
Detection Methods ◽  
Hydrological Process ◽  
Water Balance Components ◽  
Temporal And Spatial

Abstract. Temporal and spatial precipitation information is key to conducting effective hydrological process simulation and forecasting. Herein, we implemented a comprehensive evaluation of three selected precipitation products in the Jiang River Watershed (JRW) located in southwest China. A number of indices were used to statistically analyze the differences between two open-access precipitation products (OPPs), i.e. Climate Hazards Group Infra-Red Precipitation with Station (CHIRPS) and CPC-Global (CPC), and the rain gauge (Gauge). The three products were then categorized into sub-basins to drive SWAT simulations. The results show: (1) the three products are highly consistent in temporal variation on a monthly scale, yet distinct on a daily scale. CHIRPS is characterized by overestimation of light rain, underestimation of heavy rain, and a high probability of false alarm. CPC generally underestimates rainfall of all magnitudes; (2) All three products satisfactorily reproduce the stream discharges at the JRW outlet with better performance than the Gauge model. On a temporal scale, the OPPs are inferior with respect to capturing flood peak, yet superior at describing other hydrograph features, e.g. rising and falling processes and base flow. On a spatial scale, CHIRPS offers the advantage of deriving smooth, distributed precipitation and runoff due to its high resolution; (3) The water balance components derived from SWAT models with equal simulated streamflow discharges are remarkably different between the three precipitation inputs. The precipitation spatial pattern results in an increasing surface flow trend from upstream to downstream. The results of this study demonstrate that evaluating precipitation products using only streamflow simulation accuracy will conceal the dissimilarities between these products. Hydrological models alter hydrologic mechanisms by adjusting calibrated parameters. Specifically, different precipitation detection methods lead to temporal and spatial variation of water balance components, demonstrating the complexity in describing natural hydrologic processes.

PENDUGAAN EROSI DAN NERACA AIR EMBUNG DI WILAYAH PERBATASAN KABUPATEN BELU NUSA TENGGARA TIMUR

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Wahyu Widiyono
Keyword(s):  
Water Balance ◽  
Water Resource ◽  
Water Depth ◽  
Rainy Season ◽  
Water Reservoir ◽  
Water Shortage ◽  
Regional Government ◽  
Environment Management ◽  
Individual Number ◽  
Rainfall Volume

Embung as a man made water reservoir is one of methods to overcome the water shortage in the border area, Belu District, East Nusa Tenggara Province. A number of 27 embungs were built by Regional Government in this area. Embung water and environment management is the main problem to sustain water resource. The research to inventory and identify of vegetation, to predict erosion, to monitor water balance, and to optimize water utilization were conducted, in 2005-2008. The research was undertaken in Embung Leosama. Methods were survey, observation, monitoring and analysis. Results were: (1). There were 7 species and 90 individual number of tree; (2). Prediction of erosion was 97.383 ton/ha/year; (3). Water depth as indicator of embung water balance was decrease due to a little rainfall volume in rainy season 2006/2007; but it was increase in 2007/2008; (4). Embung water can be optimized for drinking cattle, horticulture, nursery and regreening irrigation.Key Words: embung, erosion, water balance.

Fully distributed versus semi-distributed process simulation of a highly managed watershed with mixed land use and irrigation return flow

2021 ◽  
Vol 140 ◽  
pp. 105000
Author(s):  
Anoop Valiya Veettil ◽  
Timothy R. Green ◽  
Holm Kipka ◽  
Mazdak Arabi ◽  
Nathan Lighthart ◽  
...  
Keyword(s):  
Land Use ◽  
Process Simulation ◽  
Return Flow ◽  
Irrigation Return Flow ◽  
Distributed Process ◽  
Mixed Land Use
Sign in / Sign up

Export Citation Format

Share Document