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اثر سطوح رطوبتی خاک بر سرعت آستانهی فرسایش بادی کانون‌های گرد و غبارجنوب و جنوب‌شرق استان خوزستان-اهواز | ||
| تحقیقات آب و خاک ایران | ||
| دوره 52، شماره 3، خرداد 1400، صفحه 869-885 اصل مقاله (1.46 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2021.316642.668864 | ||
| نویسندگان | ||
| مرجان کوهی زاده1؛ علی محمد آخوندعلی* 2؛ عزیز ارشم3 | ||
| 1گروه منابع آب، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 2استاد گروه هیدرولوژی و منابع آب ، گروه منابع آب، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 3استادیارپژوهشی، مرکز تحقیقات کشاورزی و آموزش کشاورزی و منابع طبیعی استان خوزستان، اهواز، ایران | ||
| چکیده | ||
| رخداد فرسایش بادی و به تبع آن انتشار گرد و غبار یکی از جدیترین مخاطرات زیستمحیطی کشور بوده که در دهههای اخیر، شدت و گسترش آن به روشنی رو به افزایش است. پژوهش حاضر با هدف ارزیابی میزان اثر رطوبت سطحی خاک بر سرعت آستانهی فرسایش بادی در 3 کانون فوق بحرانی گرد و غبار، واقع شده در پهنههایی از جنوب و جنوبشرقی استان خوزستان انجام شد. برای این منظور 11 نمونهی خاک از گسترهی فوق برداشت شده و پس از آمادهسازی در سطوح رطویتی هواخشک، 4، 7 و 9 درصد با استفاده از تونل باد و در قالب یک طرح کاملا تصادفی مورد آزمون قرار گرفت. نتایج مقایسهی مقادیر میانگین سرعت آستانه فرسایش بادی با بهکارگیری روش دانکن و در سطح احتمالاتی 5 درصد، اثر رطوبت را بر سرعت آستانهی فرسایش برای تمام نمونهها معنیدار ارزیابی کرد. از دیگرسو، ارتباطسنجی میان دو پارامتر رطوبت و سرعت آستانه فرسایش نشان دهندهی همبستگی این دو پارامتر بود بهگونهای که در همهی نمونه خاکهای مورد آزمون، با افزایش سطوح رطوبتی، سرعت آستانهی فرسایش بادی نیز افزایش داشت. یافتهها همچنین میزان افزایش سرعت در سطوح مختلف رطوبت را متفاوت ارزیابی کرده و نشان داد که افزایش رطوبت از هواخشک تا 4 درصد بیشترین تغییرات را در سرعت آستانه ایجاد نموده و میتواند در مهار پدیده فرسایش در این پهنه اثر قابل ملاحظهای داشته باشد. | ||
| کلیدواژه‌ها | ||
| رطوبت خاک؛ سرعت آستانه؛ تونل باد؛ خوزستان | ||
| عنوان مقاله [English] | ||
| The Effect of Soil Moisture Levels on the Threshold Velocity of Wind Erosion in Dust Centers of South and Southeast of Khuzestan Province-Ahwaz | ||
| نویسندگان [English] | ||
| Marjan Koohizadeh1؛ Alimohammd AkhondAli2؛ Aziz Arsham3 | ||
| 1Hydrology and water resources department, Faculty of water & Environmental Engineering, shahid Chamran university of Ahwaz, Ahwaz, Iran | ||
| 2Professor, department Hydrology and water resources, Faculty of water & Environmental Engineering, shahid Chamran university of Ahwaz, Ahvaz, Iran | ||
| 3- Research Assistant Professor, Research Institute of Agriculture and Natural Resources, Ahwaz, Iran | ||
| چکیده [English] | ||
| One of the most important environmental hazards that is rising drastically in IRAN in the last decade is wind erosion causing the spread of soil particles. The present study aims to evaluate the effect of soil surface moisture on the wind erosion threshold velocity in three supercritical centers of dust, located in the regions of south and southeast of Khuzestan province. For this purpose, 11 soil samples from the selected regions were collected. The soil samples were prepared in terms of moisture contents (air-dry, 4, 7, and 9%). Then they were tested in a wind tunnel based on a completely randomized design. The results of comparing the mean values of wind erosion threshold velocity using Duncan method at a probability level of 5% confirmed that the effect of moisture on the erosion threshold velocity is significant for all samples. In addition, the two parameters of moisture and erosion threshold velocity was strongly correlated in all soil samples, so that with increasing moisture levels, the wind erosion threshold velocity also increased. The findings also confirmed that the amount of increase in velocity is different depending on the levels of moisture, indicating that increasing the moisture content from air-dry to 4% level yielded the largest change in threshold velocity, which could have a substantial effect in controlling the erosion phenomenon in the study regions. | ||
| کلیدواژه‌ها [English] | ||
| Soil Moisture, Threshold velocity, Wind Tunnel, . Khuzestan | ||
| مراجع | ||
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