University of Tehran Desert 2008-0875 24 1 2019 06 01 Living windbreak design for wind erosion control in arid regions: A case study in Dehloran, Iran 33 42 72433 10.22059/jdesert.2019.72433 EN M. Mirhasani Department of Range and Watershed Management, Ilam University, Ilam, Iran N. Rostami Department of Range and Watershed Management, Ilam University, Ilam, Iran 0000-0002-9523-789X M. Bazgir Department of Water and Soil Sciences, Ilam University, Ilam, Iran M. Tavakoli Department of Range and Watershed Management, Ilam University, Ilam, Iran Journal Article 2018 06 02 <span lang="EN">Wind erosion is considered as one of the main processes of land degradation in different parts of the world. Among the most effective ways to control wind erosion is to cover land surface with natural vegetation area. In this study, 3 replica soil samples were collected, at a depth of 0-3 cm, from various land uses in Dehloran, Ilam Province, Iran. Physical and chemical characteristics of soil samples were determined in the laboratory to allow the application of the ENVI_met Headquarter model commonly used to design biological wind</span><span>break</span><span lang="EN">. The threshold friction velocity (TFV) is the basic parameter for effective construction of a windbreak. To determine its values, a wind tunnel test was conducted. Based on simulation results with the pattern designed with </span><em><span>Prosopis juliflora</span></em><span lang="EN"> species, it was observed that the wind speed decreased in front of the wind</span><span>break</span><span lang="EN"> but returned to the initial speed at </span><span>a</span><span> <span lang="EN">larger</span><span lang="EN"> distance behind the wind</span></span><span>break</span><span lang="EN">. Therefore, the designed wind</span><span>break</span><span lang="EN"> for </span><span>this</span><span lang="EN"> species is able to reduce the wind speed to a far distance </span><span>while</span><span lang="EN"> in the designed wind</span><span>break</span><span lang="EN"> with </span><em><span>Haloxylon aphyllum</span></em><span lang="EN">species the wind returns to the initial speed within a shorter distance. According to the results, the wind speed </span><span>reduction </span><span lang="EN">is directly related to the height of wind</span><span>break</span><span lang="EN">. Moreover, the designed wind</span><span>break</span><span lang="EN"> with </span><em><span>P. juliflora</span></em><span lang="EN"> species, more effectively reduce the wind speed and protect longer distances behind the wind</span><span>break; thus it</span><span lang="EN"> can be proposed as a suitable wind</span><span>break</span><span lang="EN"> for the study area. </span> https://jdesert.ut.ac.ir/article_72433_24732d73c37c67f77a206ae5f16a2ecc.pdf