Kale, Dr. M. U.THUTE, RANI SAHEBRAO.2019-03-202019-03-202018-09-06THUTE, RANI SAHEBRAO. (2018). Simulation of water front advance for online drip irrigation system by using HYDRUS-2D. Department of Irrigation and Drainage Engineering (Agricultural Engineering), Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Tech. 2018. Print. xiii, 72p. (Unpublished).http://krishikosh.egranth.ac.in/handle/1/5810099081Field experiment was conducted with drip irrigation and gypsum block sensors. The gypsum block sensors were inserted at 10 cm and 30 cm depth from soil surface along and across the lateral upto 30 cm. The combination of 4 and 8 lph and 8, 12 and 16 lit volume were used. The data generated in the field experiment was used for simulation of water front advance using HYDRUS-2D. HYDRUS-2D was set up using GRAPHICS with collected data. Richard’s equation was solved using soil moisture data and van Genuchten parameters obtained by using ROSETTA as inputs to HYDRUS. The HYDRUS model was calibrated for 4 lph discharge rate of emitter with 12 lit volume, validated for 8 lph discharge rate of emitter with 12 liter volume and tested for 4 lph discharge rate of emitter with 16 lit volume. As maximum wetting diameter for 4 and 8 lph emitter is observed as 48 and 52 cm respectively, the spacing between two emitters should not be kept more than 48 and 52 cm in case of 4 lph and 8 lph emitter respectively for the soil at study area.Drip irrigation has gained widespread popularity as an economically viable method of applying water. A constraint of drip irrigation is the number of emitters and laterals required to adequately deliver water to plant roots. During irrigation the water content in the soil changes spatially and temporally. Water distribution in the soil is strongly dependent on the design parameters of the irrigation. For effective design of drip irrigation systems, the water dynamics in soil needs to be predicted using all design parameters. The modeling of water movement in soil requires the knowledge of the soil hydrological properties especially soil water retention curve and hydraulic conductivity-water content relationship. These two basic hydrological characteristics must be defined experimentally before it is possible to carry out numerical analysis of water movement in unsaturated and saturated soils. In the present study, HYDRUS-2D was used to study the moisture movement through soil under drip irrigation system. Richard’s equation was solved using HYDRUS and vGM parameters obtained by using ROSETTA were used as input for HYDRUS. The HYDRUS model was calibrated and validated for different discharge rate and volume application combination. The modeling results showed that the HYDRUS-2D simulated the soil moisture satisfactorily in terms of statistical parameters R2 and RMSE. Effect of different discharge of emitter with combination of different volume on moisture distribution pattern was also studied and results showed that as discharge rate and volume of water increased wetted diameter also increased upto 30 hours and decreased after 30 hours from time of application. For Akola station, it was observed that the distance between two emitters should not be more than 48 and 52 cm in case of 4 lph and 8 lph emitter respectively.ennullThesis