Analytical solution for soil water redistribution during evaporation process

2013 ◽  
Vol 68 (12) ◽  
pp. 2545-2551 ◽  
Author(s):  
Jidong Teng ◽  
Noriyuki Yasufuku ◽  
Qiang Liu ◽  
Shiyu Liu
Keyword(s):  
Analytical Solution ◽  
Water Content ◽  
Soil Water ◽  
Exponential Function ◽  
Experimental Result ◽  
Water Evaporation ◽  
Evaporation Process ◽  
Climate Control ◽  
Water Redistribution ◽  
Control Apparatus

Simulating the dynamics of soil water content and modeling soil water evaporation are critical for many environmental and agricultural strategies. The present study aims to develop an analytical solution to simulate soil water redistribution during the evaporation process. This analytical solution was derived utilizing an exponential function to describe the relation of hydraulic conductivity and water content on pressure head. The solution was obtained based on the initial condition of saturation and an exponential function to model the change of surface water content. Also, the evaporation experiments were conducted under a climate control apparatus to validate the theoretical development. Comparisons between the proposed analytical solution and experimental result are presented from the aspects of soil water redistribution, evaporative rate and cumulative evaporation. Their good agreement indicates that this analytical solution provides a reliable way to investigate the interaction of evaporation and soil water profile.

scholarly journals The effect of a prototype hydromulch on soil water evaporation under controlled laboratory conditions

2020 ◽  
Vol 68 (4) ◽  
pp. 404-410
Author(s):  
Antoni M.C. Verdú ◽  
M. Teresa Mas ◽  
Ramon Josa ◽  
Marta Ginovart
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Time Course ◽  
Linear Models ◽  
Water Evaporation ◽  
Mechanical Resistance ◽  
Evaporation Process ◽  
Soil Columns ◽  
Dry Conditions

AbstractOrganic hydromulches can be an interesting alternative for weed control in perennial crops, but can also reduce soil water evaporation. To examine the effect of a hydromulch layer on soil water content in dry conditions laboratory experiments were conducted at constant 25°C, 40% air RH. Both for small soil containers with a short time course and for larger soil columns (with two sensors at depths of 6 cm and 11 cm) with a longer time course, the presence and also the thickness of hydromulch were significant factors for the temporal evolution of soil water content. Two distinct stages of the evaporation process, the first or initial stage and the last or final stage, were identified, analysed and compared for these experiments. General linear models performed on the soil water content temporal evolutions showed significant differences for the first and last stages at the top and bottom of the soil columns with and without hydromulch. Hydromulch application delayed the evaporation process in comparison with the control. Moreover, the hydromulch layer, which was tested for mechanical resistance to punching, offered enough resistance to prevent its perforation by the sprouts of weed rhizomes.

A Soil Water Characteristic Curve Model Considering Urea Concentration

2013 ◽  
Vol 798-799 ◽  
pp. 157-160
Author(s):  
You Le Wang ◽  
Dong Fang Tian ◽  
Gai Qing Dai ◽  
Yao Ruan ◽  
Lang Tian
Keyword(s):  
Experimental Data ◽  
Water Content ◽  
Soil Water ◽  
Exponential Function ◽  
Characteristic Curve ◽  
Urea Concentration ◽  
Exponential Functions ◽  
Valuable Data ◽  
Soil Water Characteristic Curve ◽  
Curve Model

A new soil water characteristic curve (SWCC) model considering urea concentration is presented in the paper. Two assumptions are used to obtain the model. One is SWCC which could be described by exponential functions in the experiments. Another is relationship between the parameters of exponential functions and urea concentration which is linear based on experimental data. In the research, we have carried out some experiments of SWCC and obtained some valuable data which could affect urea concentration. By using linear fitting, an exponential function between water content and suction and urea concentration is established.

scholarly journals Glasshouse study of a sprayable, degradable polymer to reduce water use in cotton establishment

Soil Research ◽  
2020 ◽  
Vol 58 (4) ◽  
pp. 379
Author(s):  
Priscilla Johnston ◽  
Michael Braunack ◽  
Philip S. Casey ◽  
Keith L. Bristow ◽  
Raju Adhikari
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Plant Biomass ◽  
Sandy Loam ◽  
Seedling Emergence ◽  
Chemical Properties ◽  
Water Evaporation ◽  
Degradable Polymer ◽  
Extensive Degradation

This glasshouse pot experiment demonstrated that a new sprayable and degradable polymer reduced soil water evaporation and promoted cotton seedling emergence and establishment. The polymer was tested on two contrasting soils (sandy loam and clay), representative of those used to grow cotton in Australia. Changes in soil water content in non-treated and polymer-treated pots were monitored over 80 days, after surface or subsurface watering. Plant biomass, soil water content and soil chemical properties were determined at harvest. The polymer reduced soil water evaporation by up to 35% in sandy loam and up to 20% in clay, did not compromise seedling emergence and improved plant growth per unit water applied by up to 26.2%. The polymer underwent extensive degradation after 80 days to produce low molecular-weight polymers or oligomers and water-extractable silicon species that may have implications for plant nutrition.

Modelling soil water redistribution in unsaturated zone during evaporation process

2014 ◽  
pp. 537-543
Author(s):  
Jidong Teng ◽  
Noriyuki Yasufuku ◽  
Ryohei Ishikura ◽  
Zhenbo Jiang
Keyword(s):  
Soil Water ◽  
Unsaturated Zone ◽  
Evaporation Process ◽  
Water Redistribution

scholarly journals Experimental study on water evaporation from sand using environmental chamber

2014 ◽  
Vol 51 (2) ◽  
pp. 115-128 ◽  
Author(s):  
Wei-Kang Song ◽  
Yu-Jun Cui ◽  
Anh Minh Tang ◽  
Wen-Qi Ding ◽  
Thanh Danh Tran
Keyword(s):  
Water Content ◽  
Large Scale ◽  
High Capacity ◽  
Volumetric Water Content ◽  
Water Evaporation ◽  
Surface Zone ◽  
Evaporation Process ◽  
Atmospheric Conditions ◽  
Environmental Chamber ◽  
Near Surface

Large-scale evaporation experiments were conducted on bare sand using an environmental chamber. Four different atmospheric conditions and various drying durations were imposed on the soil sample. Atmospheric parameters (air flow rate, relative humidity, and temperature) and response of the soil (volumetric water content, temperature, and soil suction) were both monitored simultaneously. Notably, the temperature and matric suction at the soil surface were monitored using an infrared thermometer and high-capacity tensiometer, respectively. The results show that the air and soil temperatures depend on the evaporation process and atmospheric conditions. In addition, volumetric water content in the near-surface zone is strongly affected by the evaporation process and changes linearly over depth. The evaporation rate is strongly dependent on the air conditions.

scholarly journals Implications of Hysteresis on the Horizontal Soil Water Redistribution after Infiltration

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2773
Author(s):  
George Kargas ◽  
Konstantinos X. Soulis ◽  
Petros Kerkides
Keyword(s):  
Porous Medium ◽  
Hydraulic Conductivity ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Matrix ◽  
Wetting And Drying ◽  
Initial Soil ◽  
Water Redistribution ◽  
Horizontal Infiltration

Although soil water redistribution is critical for a number of problems, a rather limited study of this process has been reported up to now and especially as regards the implications of hysteresis on horizontal soil water redistribution after infiltration. To this end, a thorough theoretical and numerical investigation of the redistributed soil water content profiles formed after the cessation of a horizontal infiltration is presented. A number of different initial soil water contents before the initiation of the horizontal infiltration and different infiltration depths were analyzed using the HYDRUS-1D software package considering the appropriate hysteretic wetting and drying curves. The effect of neglecting hysteresis was also investigated for the same conditions. The main wetting and drying boundary curves of the studied porous medium and the hydraulic conductivity at saturation were experimentally determined. The theoretical and numerical analysis indicated that the form of the redistributed soil water content profiles in the presence of hysteresis was similar to the original infiltration profile independently of whether the initial soil water content was taken on the boundary wetting or drying curve and independently of the porous medium type. Specifically, in a relatively short time after the initiation of the redistribution process, the magnitude of the soil matrix head gradient tended to zero due to hysteresis, and this resulted in an insignificant soil water movement, although the soil water content and the hydraulic conductivity values were still high. In addition, the redistribution proceeded at a faster rate than the smallest depth of infiltration water prior to the redistribution, and it was faster during the early stages of the redistribution. Accordingly, hysteresis is important for the simulation of horizontal soil water redistribution as it is, for example, in the case of localized irrigation systems’ design and management.

scholarly journals Ensuring the effects of climate warming; the sensitivity of controlling factors on soil respiration in Sub-Tropical grassland

2020 ◽  
Vol 7 (3) ◽  
pp. 529-540
Author(s):  
Deepa Dhital ◽  
◽  
Suman Prajapati ◽  
Sanu Raja Maharjan ◽  
Toshiyuki Ohtsuka ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Soil Respiration ◽  
Soil Temperature ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Exponential Function ◽  
Plant Biomass ◽  
Carbon Dioxide Emission ◽  
Tropical Grassland

Prevailing climate change is expected due to carbon dioxide emission to the atmosphere through soil respiration and perhaps the alteration in the terrestrial carbon cycle. The measurements to establish the effect and sensitivity of soil temperature, soil water content and plant biomass on soil respiration was performed in the sub-tropical grassland located in Central Nepal. Field measurements of soil respiration was conducted by using the closed-chamber method, and soil temperature, soil water content and plant biomass were monitored in the years 2015 and 2016. The soil respiration showed positive significant exponential function which accounted for 74.6% (R2=0.746, p<0.05) of its variation with the soil temperature. The temperature sensitivity of soil respiration, Q10 value obtained was 2.68. Similarly, soil respiration showed a positive significant exponential function that accounted for 37.2% (R2=0.372, p<0.05) of its variation with the soil water content. Remarkable seasonal and monthly variations were observed in soil respiration, soil temperature and soil water content, and the plant biomass as well followed the seasonal trend in variation of the soil respiration. Average soil respiration during measurements period was observed 325.51 mg CO2 m-2 h-1 and the annual soil respiration of the grassland in the years 2015 and 2016 was estimated 592.35 g C m-2 y-1. The study confirmed that soil temperature is the most influential primary factor in controlling soil respiration along with the soil water content and plant biomass. This research indicates that through emissions under the increasing temperature and precipitation, in the changing climate, the sub-tropical grassland could be an additional source of carbon dioxide to the atmosphere that might spur risk for further warming.

Analytical Solution for Field Soil Water Content Profiles

2021 ◽  
Vol 57 (2) ◽  
Author(s):  
Feike J. Leij ◽  
Jacob H. Dane ◽  
Antonella Sciortino
Keyword(s):  
Analytical Solution ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Field Soil

Extension of an Existing Model for Soil Water Evaporation and Redistribution under High Water Content Conditions

2009 ◽  
Vol 73 (3) ◽  
pp. 792-801 ◽  
Author(s):  
Joe T. Ritchie ◽  
Cheryl H. Porter ◽  
Jasmeet Judge ◽  
James W. Jones ◽  
Ayman A. Suleiman
Keyword(s):  
Water Content ◽  
Soil Water ◽  
High Water ◽  
Water Evaporation ◽  
High Water Content

Impacts of Maize Straw Additive on Soil Water Evaporation with Sandy Loam in the Region of Jingtai, Gansu Province

2013 ◽  
Vol 864-867 ◽  
pp. 2606-2613
Author(s):  
Jian Zheng ◽  
Yan Wang ◽  
Qian Hui Ren ◽  
Ji Xiang Wan
Keyword(s):  
Soil Moisture ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Evaporation ◽  
Burial Depth ◽  
Moisture Evaporation ◽  
Maize Leaf ◽  
Maize Straw ◽  
Maize Cob

Through laboratory experiments, the effects of adding different maize straw addictive and proportions in soil on the moisture evaporation characteristics were studied under the condition of different burial depth. Results showed that the relationship between soil moisture diffusivity and soil water content can nice described by an exponential function. Under the same soil water suction, soil water content of treatments with maize straw additive are all higher than pure soil. Between the treatments of soil with 3% maize cob and maize leaf, maize leaf treatment has a better water retention effect, but the difference is little in the treatments with 1% maize straw additive; maize leaf is superior to maize cob in the capacity of inhibiting soil water evaporation, and the treatment with 3% maize leaf in the depth of 0-5 centimeter soil layer can reduce soil moisture evaporation effectively. Keywords: maize straw addictive, soil water diffusivity, buried depth, accumulative soil water evaporation, soil water content

Sign in / Sign up

Export Citation Format

Share Document