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Development and calibration of a soil water balance model for paddy field in humid climatic condition.

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Title Development and calibration of a soil water balance model for paddy field in humid climatic condition.
Not Available
 
Creator Sethi, R.R., Kumar, A., Sharma, S.P., Singhandhupe, R.B. and Das, M.
 
Subject (Groundwater, Percolation, Paddy Field, Soil Water Balance Model)
 
Description Not Available
Study was conducted in Munijhara watershed located in Nayagarh block of Odisha (India), which
is mainly dominated by hard rock aquifer. Groundwater withdrawal was more than the annual
recharge to the aquifer, which resulted in decline of ground water table depth over the years.
Natural groundwater recharge was estimated to be around 13-40 cm/year. Attempt has been
taken up towards increasing the recharge rate to the aquifer by various means. As paddy field
contributes maximum amount of percolation to groundwater, a soil water balance approach
was developed for estimating percolation losses in the paddy field during Kharif 2007 and 2008
for both unsaturated and saturated conditions. For modeling purpose, the effective root zone
of paddy (45 cm) was considered as a single layer, upward capillary rise of groundwater was
neglected. All observed water balance components were compared with the model data. A good
correlation coefficient was obtained for simulated evapotranspiration and seepage. As it is
difficult to empirically measure the exact percolation rate due to heterogeneous water movement
in the soil profile, simulated percolation rate were found to follow a similar trend with that of
the observed values. The objective was to understand and rate of percolation in different soil
conditions within the watershed, and results of soil water balance model could be used as one
of input to the groundwater model. Based on the soil-water balance approach, it was calculated
that about 16-23% of total rainfall received during cropping period (paddy) was percolated down
and contributed to the groundwater. For regional scale modeling approach, it is needed to
combine both soil water balance and groundwater model for quantification of any hydrological
components. Hence findings showed that soil water balance method can be used to estimate
recharge in a particular basin and the result can very well be an input while designing an
integrated groundwater model at a macro level or at a regional scale.
Not Available
 
Date 2021-07-16T09:20:54Z
2021-07-16T09:20:54Z
2012
 
Type Research Paper
 
Identifier Sethi, R.R., Kumar, A., Sharma, S.P., Singhandhupe, R.B. and Das, M. 2012. Development and calibration of a soil water balance model for paddy field in humid climatic condition. J. Indian Soc. Coastal Agric Res. 30 (2):55-59.
0972-1584
http://krishi.icar.gov.in/jspui/handle/123456789/48428
 
Language English
 
Relation Not Available;
 
Publisher Indian Society of Coastal Agricultural Research