Experimental and Numerical Evaluation of Analytical Volume Balance Model for Soil Water Dynamics under Drip Irrigation

2003 ◽  
Vol 67 (6) ◽  
pp. 1657-1671 ◽  
Author(s):  
Khumoetsile Mmolawa ◽  
Dani Or
Keyword(s):  
Soil Water ◽  
Drip Irrigation ◽  
Numerical Evaluation ◽  
Water Dynamics ◽  
Balance Model ◽  
Soil Water Dynamics ◽  
Volume Balance

scholarly journals Parameterization of Soil Hydraulic Parameters for HYDRUS-3D Simulation of Soil Water Dynamics in a Drip-Irrigated Orchard

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1858 ◽  
Author(s):  
Jesús María Domínguez-Niño ◽  
Gerard Arbat ◽  
Iael Raij-Hoffman ◽  
Isaya Kisekka ◽  
Joan Girona ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Soil Water ◽  
Drip Irrigation ◽  
Water Dynamics ◽  
Hydraulic Parameters ◽  
Soil Water Dynamics ◽  
Heterogeneous Distribution ◽  
Neutron Probe ◽  
Soil Hydraulic Parameters ◽  
Soil Hydraulic

Although surface drip irrigation allows an efficient use of water in agriculture, the heterogeneous distribution of soil water complicates its optimal usage. Mathematical models can be used to simulate the dynamics of water in the soil below a dripper and promote: a better understanding, and optimization, of the design of drip irrigation systems, their improved management and their monitoring with soil moisture sensors. The aim of this paper was to find the most appropriate configuration of HYDRUS-3D for simulating the soil water dynamics in a drip-irrigated orchard. Special emphasis was placed on the source of the soil hydraulic parameters. Simulations parameterized using the Rosetta approach were therefore compared with others parameterized using that of HYPROP + WP4C. The simulations were validated on a seasonal scale, against measurements made using a neutron probe, and on the time course of several days, against tensiometers. The results showed that the best agreement with soil moisture measurements was achieved with simulations parameterized from HYPROP + WP4C. It further improved when the shape parameter n was empirically calibrated from a subset of neutron probe measurements. The fit of the simulations with measurements was best at positions near the dripper and worsened at positions outside its wetting pattern and at depths of 80 cm or more.

In-situ soil water dynamics under different irrigation methods in North East India

2017 ◽  
Vol 4 (2) ◽  
Author(s):  
JOY K DEY ◽  
LALA IP RAY ◽  
Y. MARWEIN
Keyword(s):  
Soil Water ◽  
Drip Irrigation ◽  
Clayey Soil ◽  
Root Zone ◽  
Soil Layer ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Irrigation Methods ◽  
North East

Availability of in-situ soil water plays a major role in exploiting the potential yield of crops under irrigated conditions. Depending on type of irrigation, variations of soil water is mostly observed at different soil depths within the root zone. The deviation of soil water at the edaphic zone becomes a deciding factor in assuring optimum yield. As availability of irrigation water is a great concern during non-rainy season, water saving irrigation techniques need to be adopted to maximize the productivity under hilly terrain. An experiment was laid out with potato as a test crop under the valley region of Meghalaya plateau on sandy clayey soil to study in-situ soil water dynamics under three different irrigation methods viz. furrow, micro-sprinkler and gravity-fed drip. Irrigation was scheduled at every weekly basis to restore back the soil water required to achieve the field capacity. Mean value of soil water up to 15 cm depth was 21.75, 22.65 and 23.45%, however, range (minimum to maximum) was 16.21-29.17; 15.56-29.21 and 17.84-28.97% for furrow, micro-sprinkler and gravity-fed drip irrigation, respectively. Co-efficient of variation was found to be the maximum (4.65%) for furrow over other two types of irrigations during the weekly interval. Deviation of in-situ soil water was found to vary rapidly at upper layer (30 cm) under furrow method of irrigation; but at deeper soil layer rapid variation was not observed. Water use efficiency of potato was evaluated to be 14.66, 18.78, 20.63 kg ha-1 mm-1 for furrow, micro-sprinkler and gravity-fed drip irrigation, respectively.

Effects of Dripper Discharge and Irrigation Amount on Soil-Water Dynamics under Subsurface Drip Irrigation

2011 ◽  
Vol 347-353 ◽  
pp. 2400-2403 ◽  
Author(s):  
Xiao Ning Mei ◽  
Zhen Zhong Shen ◽  
Jie Ren ◽  
Zhen Hua Wang
Keyword(s):  
Soil Water ◽  
Drip Irrigation ◽  
Water Dynamics ◽  
Subsurface Drip Irrigation ◽  
Design Parameters ◽  
Wetting Front ◽  
Soil Water Dynamics ◽  
Irrigation Amount ◽  
Irrigation Design ◽  
Subsurface Drip

Subsurface drip irrigation (SDI) that has a wide application prospect is one of the high efficiency water-saving irrigation techniques. Research on regulation of soil-water dynamics in irrigation design parameters of SDI has important points in improving its irrigation design and guiding its practical function. In this study, soil wetting patterns were investigated in laboratory experiments which were operated at three different dripper discharges (0.76, 1.15 and 1.25 l h-1) and two different irrigation amounts (4.6 and 9.2 l). The results showed that, (1) with the increase of dripper discharges from 0.76 l h-1 to 1.25 l h-1, water content around the emitter are increasing from 0.225 cm3 cm-3 to 0.300 cm3 cm-3, (2) increasing the dripper discharge and irrigation amount increased the size of the wetted zone, (3) upward distance of the wetting front is less than downward distance and horizontal distance of the wetting front presents symmetry distribution at the same the dripper discharges and irrigation amount, (4) with the increase of irrigation amounts from 4.6 l to 9.2 l, water contents of the vertical and horizontal direction are increasing 10% to 20%.

Simulation of Soil Water Dynamics Under Surface Drip Irrigation from Equidistant Line Sources

2013 ◽  
Vol 27 (12) ◽  
pp. 4131-4148 ◽  
Author(s):  
Stamatios Elmaloglou ◽  
Konstantinos X. Soulis ◽  
Nicholas Dercas
Keyword(s):  
Soil Water ◽  
Drip Irrigation ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Surface Drip Irrigation

scholarly journals The influence of magnetized water on soil water dynamics under drip irrigation systems

2017 ◽  
Vol 180 ◽  
pp. 70-77 ◽  
Author(s):  
Ahmed A.M. Al-Ogaidi ◽  
Aimrun Wayayok ◽  
M.K. Rowshon ◽  
Ahmad Fikri Abdullah
Keyword(s):  
Soil Water ◽  
Drip Irrigation ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Irrigation Systems ◽  
Magnetized Water
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