Estimation of Groundwater Recharge in Limestone Aquifer using an Improved Soil Moisture Balance Method: A Case Study in Jaffna District

Mikunthan, T.; Silva, CS De

doi:10.4038/tar.v21i1.2586

Cited by 8 publications

(9 citation statements)

References 10 publications

(4 reference statements)

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“…Specific yield of the limestone aquifer varied from 0.15 to 0.29 with the average value of 0.27 at Thirunelvely (Mikunthan and De Silva, 2009). …”

Section: Estimating Recharge Using Water Table Fluctuationmentioning

confidence: 99%

“…The potential groundwater recharge simulated by HYDRUS-1D is compared with potential groundwater recharge estimated by modified soil moisture balance (MSMB) method (Mikunthan and De Silva, 2009) and water table fluctuation (WTF) method based on groundwater levels monitored in the study area. For the completeness of this paper these two methods (MSMB and WTF) are summarized below.…”

Section: Evaporation and Transpirationmentioning

confidence: 99%

“…Crop (Cabbage) data such as date of planting, full emergence of crop, duration of initial, development, mid and late stage, date of harvesting, root zone depth and soil data such as field capacity, permanent wilting point and bulk density recorded from the field in Thirunelvely were also used in this simulation (Mikunthan and De Silva 2009). Crop coefficients for required crops were taken from Allen et al (1998).…”

Section: Data For Simulationmentioning

confidence: 99%

“…The actual infiltration of soil zone may be reduced due to interception or runoff. Runoff coefficient based on rainfall intensity and SMD were used in this model (Mikunthan and De Silva, 2009). …”

Section: • Runoffmentioning

confidence: 99%

“…The modelling approach used HYDRUS-1D (Šimůnek et al, 2005); a well known numerical computer model that simulates water, heat and solute movement in variably saturated porous media. This study also provides an opportunity for comparing recharge rates estimated with modified soil moisture balance (MSMB) method and water table fluctuation method (WTF) by Mikunthan and De Silva (2009) at similar sites.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Potential Groundwater Recharge from the Jaffna Peninsula of Sri Lanka using HYDRUS-1D Model

Silva

2015

OUSL Jnl

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In drier regions, accurate knowledge of groundwater recharge is important for the sustainable management of scare water resources. Thirunelvely in Jaffna Peninsula is an area where groundwater is being utilized for domestic, agricultural and municipal water supply. Further the groundwater in this area also contaminated with nitrogenous fertilizer application due to intensive agriculture, as post war conditions in the Peninsula encourage farmers to engage in intensive agricultural activities. Very few or no studies have been conducted in the recent past on groundwater recharge or solute transport such a fertilizer leaching in this area. HYDRUS-1D is a Windows-based modelling environment for analysis of water flow and solute transport in variably saturated porous media. HYDRUS-1D is just as quick and cheap as other soil moisture balance models but more physically based and flexible as it allows for building up complexity as data are available whether for solute transport or non-equilibrium flow etc. Therefore the main objective of this paper is to simulate potential groundwater recharge using HYDRUS-1D and compare it with the results obtained in Thirunelvely using soil moisture balance and water table fluctuation methods. Results have shown that the HYDRUS-1D simulated potential groundwater recharge (41.8 cm) has close agreement with that estimated by other methods with high coefficient of determination (R 2 = 0.95). Further runoff, soil moisture storage and bottom pressure head simulated by HYDRUS-1D too have good agreement with field observation. Therefore HYDRUS-1D is capable of simulating potential groundwater recharge close to the previously estimated values in Thirunelvely as it has good agreement with the water table fluctuation measured in the study site and the bottom head pressure at the 1 m soil profile simulated in the HYDRUS-1D model. Now that it has been demonstrated that HYDRUS-1D adequately reproduces the water fluxes predicted by other C S. De Silva 44 methods, it could be used for groundwater recharge with more confidence and to investigate pollution in soil zone and groundwater.

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“…Specific yield of the limestone aquifer varied from 0.15 to 0.29 with the average value of 0.27 at Thirunelvely (Mikunthan and De Silva, 2009). …”

Section: Estimating Recharge Using Water Table Fluctuationmentioning

confidence: 99%

Section: Evaporation and Transpirationmentioning

confidence: 99%

Section: Data For Simulationmentioning

confidence: 99%

Section: • Runoffmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%