INVESTIGATION ON SOIL TEMPERATURE REGIME AND FROST DEPTH OF SOIL IN LABORATORY MODEL

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RAHNAMA YAMI E.; KHALILI ALI; RAHIMI H.

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Journal: INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN) Year:2008 | Volume:19 | Issue:8-2 (SUPPLEMENT CIVIL ENGINEERING) Page(s): 79-89

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Title

INVESTIGATION ON SOIL TEMPERATURE REGIME AND FROST DEPTH OF SOIL IN LABORATORY MODEL

Author(s)

RAHNAMA YAMI E. | KHALILI ALI | RAHIMI H. | Issue Writer Certificate

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Abstract

Freezing depth is one the important climatic indices in the field of agriculture, civil engineering and etc. This parameter depends on different factors such as astronomical factors, temperature of surface air, amount of humidity, soil characteristics such as texture, heat capacity, thermal conductivity, and specific heat. In this study, for investigating the effect of air temperature on freezing dept, a soil freezing apparatus was made which is able to produce temperatures up to-23°C. To measure and record the soil temperatures at depths of 10, 20, 50, and 70 cm, a direct measurement system was designed. Sensors of the system include electronic thermostat, which was inserted at different depths of soil. Variation of temperature measured by these sensors, were transferred to a transformer, and the results of measurements transferred to a computer in the form of binary codes. These codes were processed by a computer program and converted to a numerical form. After the calibration, several experiments were conducted using soil bins of different textures including clay, clay-sand, and sand a moisture content of 0, 10, and 15 percent. The results of experiments are summarized as following: Freezing depth of soil in dry state (0% moisture content) for soils having smaller pores (such as clay), is less than soils having larger pores (such as sand). The advancing speed of freezing front has also a similar trend. By increasing the soil moisture (0% to 10%), for all soils the depth of freezing and the advancing speed of freezing front were increased. This condition in soils having finer texture is more pronounced than the soils of coarse texture. By increasing the amount of soil moisture content, the clay soil maintains its moisture throughout its depth, while in sandy and clay-sandy soils, the moisture content decreasing from top to the bottom (due to drainage). This phenomenon affects the advancing speed of freezing front of these soils. Finally, the correlation between the time of soil freezing (t), and the temperature at different depths during the freezing process (T), was investigated, and concluded that it can be written in the form of { T= (a * b) + c * td/b+td}, which is significant at 1% level for all three types of soils.

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APA: Copy

RAHNAMA YAMI, E., KHALILI, ALI, & RAHIMI, H.. (2008). INVESTIGATION ON SOIL TEMPERATURE REGIME AND FROST DEPTH OF SOIL IN LABORATORY MODEL. INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN), 19(8-2 (SUPPLEMENT CIVIL ENGINEERING)), 79-89. SID. https://sid.ir/paper/65656/en

Vancouver: Copy

RAHNAMA YAMI E., KHALILI ALI, RAHIMI H.. INVESTIGATION ON SOIL TEMPERATURE REGIME AND FROST DEPTH OF SOIL IN LABORATORY MODEL. INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN)[Internet]. 2008;19(8-2 (SUPPLEMENT CIVIL ENGINEERING)):79-89. Available from: https://sid.ir/paper/65656/en

IEEE: Copy

E. RAHNAMA YAMI, ALI KHALILI, and H. RAHIMI, “INVESTIGATION ON SOIL TEMPERATURE REGIME AND FROST DEPTH OF SOIL IN LABORATORY MODEL,” INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN), vol. 19, no. 8-2 (SUPPLEMENT CIVIL ENGINEERING), pp. 79–89, 2008, [Online]. Available: https://sid.ir/paper/65656/en

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