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TRANSCRIPT
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Presented By
Dinagara Pandi P
SOIL WATER BALANCE MODEL OVER CHITTAR SUBBASIN, TAMILNADU.
Dinagara Pandi P
Research Scholar
School of Mechanical and Building Sciences
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1. Background information
2. Objectives
3. Methodology
OUTLINE
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4. Input variables
5. Calibration and Validation
6. Results and Discussions
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A water balance model, also called a mass balance model, isan application of conservation of mass to a particular spatialunit.
1.INTRODUCTION
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CONTD.,
Tally the soil water balance as
SWn = Σi SWn-1 + Σi (precipitation – SURQ – ET – LATQ – GWQ)
LATQ - Lateral flow contribution to reach
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LATQ - Lateral flow contribution to reach
GWQ - Groundwater discharge into reach
SURQ - Surface runoff generated during time step
ET - Actual evapotranspiration in watershed
i - time interval and n – number of days
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Developing monthly water balance model for the Chittarsubbasin.
The model is calibrate/validated with the Gauge Discharge.
2.OBJECTIVES
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The model is calibrate/validated with the Gauge Discharge.
Understanding the spatial and temporal distribution ofevapotranspiration, evaporation, Infiltration, Soil moistureand groundwater level fluctuation over the catchment area.
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KEY MAP
Latitude - 8o25’ to 9o13’ N and Longitudes - 77o10’ to 78o10’ E
Thamirabarani Basin : Area: 5382 sq.km. River Length: 125 km
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River Length: 125 km
Chittar Sub-basin :Area: 1600 sq.km. River Length: 73 km
Climate : Hot and Dry 25o to 40o C
Annual rainfall - 880 mm
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3.METHODOLOGY
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4.INPUT VARIABLES
Data Source
Topography map Cartosat-DEM
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Landuse map Satellite imagery
Soil Texture map
India -WRIS
Gauge Discharge
Meteorological Global weather data
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GIS INPUT VARIABLES
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5. CALIBRATION AND VALIDATION
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CONTD.,
Parameter Name Fitted_Value Min_value Max_value
R__CN2.mgt -0.041 -0.1 0.1
V__ALPHA_BF.gw 0.355 0 1
A__GW_DELAY.gw 187 0 200
A__GWQMN.gw 1790 0 2000
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A__GWQMN.gw 1790 0 2000
R__GW_REVAP.gw 0.0983 0.02 0.2
R__SOL_AWC(..).sol 9.900001 -10 10
R__SOL_K(..).sol -0.9 -10 10
R__SURLAG.bsn 49.25075 0.05 50
R__CH_K2.rte 192.5061 0.01 500
R__CH_N2.rte 0.05275 0.01 0.2
R__REVAPMN.gw 452.5 0 500
R__ESCO.hru 0.965 0 1
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CONTD.,
Calibration period of 2001-2010p-factor r-factor R2 NS bR2 PBIAS KGE RSR
0.24 0.45 0.68 0.62 0.32 -8 0.53 0.62
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Validation period of 2011-2013p-factor r-factor R2 NS bR2 PBIAS KGE RSR
0.61 1.95 0.36 0.31 0.18 -0.7 0.57 0.83
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1. Precipi tat ion, Sur face runof f , Lateral runof f ,Groundwater recharge, Evapotranspirat ionand So i l water content are used.
2 . Sur face runof f , Lateral Runof f are purelydepend upon the precipi tat ion . Where Octoberand November are higher f luctuations.
3 . Groundwater recharge happens af ter therunof f occurs , month of December usual ly
6.RESULTS & DISCUSSIONS
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runof f occurs , month of December usual lyoccurs.
4 . Evapotranspirat ion are interdependent onothers where i t happens more in summerseason.
5 . Soi l water content denotes the higher af terthe recharge and runof f .
6 . Precipi tat ion wil l be major account of waterbalance model .
7 . Sur face runof f and Evapotranspirat ion wi l l bemajor loss of water balance model .
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Soi l Water ba lance: 2001-2013
From the water balance model , i t var ied from lowas -120 and high as 210 mm/month of soi l watercontent over the catchment.
Almost the movement of so i l water content overthe catchment regular f luc tuation within themonth per iod.
CONTD.,
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month per iod.
As per nor th west monsoon, October to Decembersuddenly increase the so i l water content due toprecipi tat ion contr ibut ion .
Except 2001 , 2008 , and 2011 of soi l watercontent is s l ight ly upward on March to July, i tcombines the Summer and touch the South westmonsoon.
As total ly, 846 mm/month (2001 -2013)approx imately is s tored at the chi t tar catchment .
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