Effect of water table depth on evaporation from soil

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

CHARI M.M.; AFRASIAB P.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Journal of Water and Soil Conservation Year:2019 | Volume:26 | Issue:3 Page(s): 177-192

Download Full-Text

Persian Verion

View:

1,503

Download:

Cites:

Information Journal Paper

Title

Effect of water table depth on evaporation from soil

Author(s)

CHARI M.M. | AFRASIAB P. | Issue Writer Certificate

Keywords

Evaporation frontQ1

LoamQ2

Water table depthQ1

Abstract

Background and Objectives: The relation between Water table depth and evaporation rate from bare soil is of great importance in arid and semi-arid areas. In this region, due to over irrigation, the water table is very close to the ground surface which leads to salinization of the soil. Evaporation from soil columns in the presence of a water table is of importance and has received great attention for many decades. The soil-drying process has been observed to occur in three recognizable stages. The first stage is evaporation with constant intensity. The second stage is evaporation in descending order. The third stage is the residual evaporation of low intensity, which begins after excessive drying of the surface layer of the soil and its effect on reducing the hydraulic conductivity of the soil. Given the importance of evaporation from the surface of the station in arid and semi-arid regions, it is necessary to measure this parameter accurately. The purpose of this study was to determine the effect of Water table depth on the evaporation from soil surface, as well as the determination of different evaporation stages. Materials and Methods: The soil used in this experiment was Loam with a bulk density of 1. 32 gr/cm3. The experiment was conducted in a greenhouse and the duration was 74 days. Soils were sived through a 2-mm mesh and then packed into the soil columns using soil funnel. PVC tubes with a diameter of 250 mm were used to provide test columns. Water table was stabilized at depths of 400, 600 and 800 mm from the soil surface, and the experiment was repeated twice. For stabilizing the water table in different depths, each soil columns contained a pipe from the bottom, to supply water from bottles that maintained the water table constant. The water losses from the soil profile was measured at different depths and times using Delta-T Device Moisture Meter. Results: The results showed that water content between 0 and 160 mm in the soil column decreased during the experiment and the lower layers remained saturated. In the steady-state, the rate of water loss from bottle next to the soil column is equal to the rate of evaporation from the soil surface. In a non-steady-state, the evaporation rate from the soil surface is equal to the total loss of water from the water table and the water lost from the soil profile. The cumulative evaporation in the 74-day interval from the stopping surface, 400, 600 and 800 mm was 384. 6, 312. 3 and 293. 4 mm, respectively. The maximum evaporation from the water table was related to a depth of 400 mm and equal 384. 6 mm and the highest water loss from the soil profile was related to a depth of 800 mm and equal 51. 3 mm. By increasing the Water table depth from 400 to 800 mm (increased 100%), the evaporation rate from the water table and the total evaporation from the soil surface decreased by 24 and 16. 5 percent, respectively. The length of the first stage of the evaporation for the Water table depth 400 mm was 2 days and for 800 mm less than 1 day. Conclusion: The results of this study presented information for us regarding the flow of water above the shallow water table. Water content changes in the soil surface soil are higher than close water table. Movement of water close water table is liquid and close the soil surface is in the form of vapor. The duration of the first stage of evaporation has decreased with increase Water table depth. In general, it can be concluded that evaporation from the water table can provide a large portion of the water requirement by the plants.

Cites

No record.

References

No record.

Cite

APA: Copy

CHARI, M.M., & AFRASIAB, P.. (2019). Effect of water table depth on evaporation from soil. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 26(3 ), 177-192. SID. https://sid.ir/paper/156522/en

Vancouver: Copy

CHARI M.M., AFRASIAB P.. Effect of water table depth on evaporation from soil. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2019;26(3 ):177-192. Available from: https://sid.ir/paper/156522/en

IEEE: Copy

M.M. CHARI, and P. AFRASIAB, “Effect of water table depth on evaporation from soil,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 26, no. 3 , pp. 177–192, 2019, [Online]. Available: https://sid.ir/paper/156522/en

Related Journal Papers