A combined technique of floodplain storage and reservoir irrigation for paddy rice cultivation |
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Authors: | Paradis Someth Naritaka Kubo Hajime Tanji |
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Institution: | (1) United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan;(2) Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan;(3) Department of Hydraulics, National Institute for Rural Engineering, 2-1-6 Kannondai, Tsukuba, Ibaraki 305-8609, Japan |
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Abstract: | This paper introduces an irrigation system developed in the floodplain of a lake and studies the water management technique
of the irrigation system by estimating the total water balance of the whole system. The system is characterized by a reservoir
combined with a dike system in the floodplain of the Tonle Sap Great Lake and an irrigation system. Two main models are used
for calculating the total water balance. The first model is the water balance of the reservoir. The inputs to the model are
water level of the reservoir, precipitation, lake evaporation, infiltration, and area–volume curve of the reservoir. The outputs
are inflow and outflow of the reservoir. The supply from the reservoir to paddy fields is computed from the outflow. The second
model is the water balance of paddy fields, based on which the water requirement in paddy fields is derived. The reference
evapotranspiration needed to calculate the water requirement is simulated for monthly time series using the FAO Penman–Monteith
model. Since there is no drainage network in the irrigation system, surface drainage and runoff are not included in the calculation
of the water balance, and seepage is considered negligible in the flat floodplain area. The evapotranspiration, rice variety,
soil type and irrigated area are used to simulate water consumption in paddy fields. Finally, the two models are connected
to produce the total water balance from the reservoir to paddy fields. The total outflow from the reservoir is estimated and
the total water consumption for dry season cultivation is also determined. Finally, the efficiency of the whole system is
examined. |
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Keywords: | Floodplain storage Inflow and outflow hydrograph Paddy field Reference evapotranspiration Reservoir irrigation Water balance model |
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