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Selçuk Üniversitesi (2020)

The effects of some soil conditioners on wind erosion : Laboratory scale wind tunnel study

ERCİ Vildan

Titre : The effects of some soil conditioners on wind erosion : Laboratory scale wind tunnel study

Bazı toprak düzenleyicilerin rüzgâr erozyonuna olan etkileri : Laboratuvar ölçekli rüzgâr tüneli çalışması

Auteur : ERCİ Vildan

Université de soutenance : Selçuk Üniversitesi

Grade : DOKTORA TEZİ 2020

Résumé
Erosion, which is an important environmental problem in semi-arid and arid, has started with the formation of earth and climate events. Erosion is a continuous event that accelerates with human-soil relations and its damages have been realized late. In order to take necessary precautions, erosion and its effects should be well known, and solutions should be produced accordingly. Thanks to the studies based on the laboratory wind tunnel, the disadvantages of the field conditions can be eliminated, and more stable tests can be performed in a shorter time in order to increase the threshold speed value which is an important factor for erosion. In this thesis, a laboratory-scale wind tunnel with a dimension of 0.4x0.4x5 m was designed in order to test the effect of many applications towards the existing wind erosion problem in a short time and to propose solutions to this problem. The wind speeds of 5, 7, 9 and 11 m s-1 in the designed wind tunnel were determined as reference speeds to determine the wind profile and speed distribution. Wind speed measurements were made with 2 precision anemometers for each determined height from each of the measuring points (28 in total) located at 0.5-1.5-2-2.5 m from the beginning of the tunnel body. This process was repeated for each reference speed separately to obtain wind speed measurement results at a total of 2240 points along the wind tunnel, thereby revealing the profile and speed distribution of the wind tunnel. Soil samples with loamy sand and silty clay loam textures taken from untreated agricultural areas in Sarıcalar and Karapınar locality in Konya plain were used to determine the effects of some application to the wind erosion under the conditions created in the laboratory. Molasses, cement, molasses + cement mixture, and hydrogel in different doses (6.66-13.33-26.66-53.33g m-2) were applied to 0.5 kg soil samples with 0.075 m2 surface area, exposed to erosion under certain conditions, and allowed to incubate for 24 hours. At the end of this period, treated soil samples placed separately in the test room of the wind tunnel were exposed to 2 different wind speeds (9 and 11 m s-1) for 10 minutes. Consequently, the reduction in the amount of soil loss by erosion was determined by weighing the soil amounts in each pan before and after erosion. As a result, hydrogel applications for both soil samples at wind speeds of 9 and 11 m s-1 were highly effective at doses of 13.33, 26.66 g m-2 and above, respectively. In addition, the application of the 13.33 g m-2 and above in cement and cement molasses mixture were found to have approximately the same effect statistically. The current doses of molasses used in the study have been limited in effectiveness in preventing erosion under experimental conditions and it might be appropriate to try higher doses and different applications in subsequent studies. Considering effects of the applications used in this study on erosion prevention, we found that hydrogel prevents wind erosion better than other soil conditioners because of the formation of the crust layer on the surface. However, as a result, it has been concluded that using cement or a mixture of cement and molasses as an alternative to hydrogel might be more convenient because it is easily accessible and cost effective.

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Page publiée le 2 janvier 2023