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ارزیابی صحرایی چند رابطه تحلیل اندازه ذرات برای تخمین هدایت هیدرولیکی بستر رودخانه | ||
| تحقیقات آب و خاک ایران | ||
| دوره 51، شماره 8، آبان 1399، صفحه 2007-2021 اصل مقاله (1.29 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2020.292350.668555 | ||
| نویسندگان | ||
| حجت کثیر1؛ امیر ناصرین* 2؛ احمد جعفری3؛ محمود شفاعی بجستان4 | ||
| 1گروه مهندسی آب. دانشکده مهندسی زراعی و عمران روستایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران. | ||
| 2گروه مهندسی آب، دانشکده مهندسی زراعی و عمران روستایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران. | ||
| 3گروه مهندسی آب، دانشکده مهندسی زراعی و عمران روستایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران | ||
| 4گروه سازه های آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران. | ||
| چکیده | ||
| برای تعیین میزان تبادلات آبی بین آبهای سطحی و زیرزمینی از طریق بستر رودخانه، تعیین دقیق هدایت هیدرولیکی آنها ضروری است. اما اندازهگیری هدایت هیدرولیکی بستر رودخانه دشوار، وقتگیر و هزینهبر است. روشهای تحلیل اندازه ذرات با استفاده از دادههای حاصل از منحنی توزیع ذرات و تخلخل، میزان هدایت هیدرولیکی را بدون اندازهگیری صحرایی تخمین میزنند. هدف از انجام این تحقیق مقایسه هدایت هیدرولیکی برآورد شده با استفاده از چند رابطه تجربی اندازه ذرات (Kg) با هدایت هیدرولیکی اندازهگیریشده بهروش نفوذسنج (Kv) در بستر رودخانههای کرخه، دز و شاوور در محدوده شهرستان شوش استان خوزستان میباشد. در این تحقیق، دقت هفت رابطه تجربی، با استفاده از 18 نمونه حاصل از نقاط اندازهگیری، بررسی شد. هدایت هیدرولیکی در رودخانههای کرخه، دز و شاوور بهترتیب 15/2، 94/2 و 03/0 متر بر روز اندازهگیری شد. در بستر رودخانه شاوور با بافت رسی، همه روابط Kg را تا 6/84 برابر بیش از Kv برآورد کردند. اما در بستر دو رودخانه دیگر که خاک درشت دانه داشتند، مقدار Kg رابطه الیمانی و سن کمتر و روابط ترزاقی، هیزن، بیر و USBR بیشتر و دو رابطه اسلیشتر و کوزنی نزدیک بهمقدار Kv بود. همچنین، ضرایب پیشنهادی C روابط مختلف اندازه ذرات نسبت به ضرایب اصلی در آن روابط، در بازه 15/0 تا 1/2 محاسبه شد. با توجه به نتایج این پژوهش، برای استفاده از روابط تجربی یادشده در تعیین Kv، استفاده از ضرایب اصلاحی C ضروری میباشد. | ||
| کلیدواژه‌ها | ||
| تبادلات آبی؛ دز؛ شاوور؛ کرخه؛ هدایت هیدرولیکی عمودی | ||
| عنوان مقاله [English] | ||
| Field Evaluation of Some of the Grain-size Analysis Methods for Determining Hydraulic Conductivity of Streambed | ||
| نویسندگان [English] | ||
| Hojjat Kasir1؛ Amir Naserin2؛ Ahmad Jafari3؛ Mahmood Shafai Bejestan4 | ||
| 1Department of Water Engineering, Faculty of Agricultural Engineering and Rural Development,, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz,, Iran. | ||
| 2Department of Water Engineering, Faculty of Agricultural Engineering and Rural Development, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz, Iran | ||
| 3Department of Water Engineering, Faculty of Agricultural Engineering and Rural Development, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz, Iran | ||
| 4Department of Hydraulic Structures, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz,, Ahvaz, Iran. | ||
| چکیده [English] | ||
| To determine the water exchanges between surface and ground waters through river bed, it is necessary to have an accurate estimation of hydraulic conductivity of the river bed. But, the measurement of river bed hydraulic conductivity is difficult, time-consuming and costly. The grain size analysis methods estimate the hydraulic conductivity using the data obtained from the grain size distribution curve and the porosity of the soil, without any field measurements. The purpose of this study is to compare the estimated hydraulic conductivities, using some grain-size analysis equations (Kg), with the values measured by permeameter (Kv) method in Karkheh, Dez and, Shavoor river beds in Shush County, Khuzestan Province. In this study, the accuracy of seven empirical equations were investigated using 18 samples obtained from the measuring stations. The Kv values at Karkheh, Dez, and Shavoor river bed were measured to be 2.15, 2.94 and 0.03 m/day, respectively. In Shavoor River bed with clay texture, all the equations overestimate the Kg up to 84.6 times more than the Kv. While, in the other rivers with coarse grains, the estimated Kg by Alyamani-sen was less than the Kv, and the Kg estimated by Terzaghi, Hazen, Beyer and USBR was more than the Kv and the Kg estimated by Slichter and Kozney equations resulted a Kg close to the Kv. Moreover, the ratio of the new proposed C coefficient to the original C coefficient of equations were calculated between "0.15 to 2.1". Based on the results, it is necessary to use the modified coefficient of C for utilization of grain size methods. | ||
| کلیدواژه‌ها [English] | ||
| Dez. Karkheh, Shavoor, Vertical hydraulic conductivity, Water exchanges | ||
| مراجع | ||
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