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تأثیر سیستم ریشهای علف و تیور بر پارامترهای مقاومت برشی ساحل رودخانه (مطالعۀ موردی: رودخانۀ کر) | ||
اکوهیدرولوژی | ||
مقاله 1، دوره 5، شماره 3، مهر 1397، صفحه 727-738 اصل مقاله (787.63 K) | ||
نوع مقاله: پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ije.2018.234283.615 | ||
نویسندگان | ||
حسین حمیدیفر* 1؛ مهدی بهرامی2؛ محمدجواد امیری2 | ||
1استادیار بخش مهندسی آب، دانشگاه شیراز | ||
2استادیار گروه مهندسی آب، دانشگاه فسا | ||
چکیده | ||
فرسایش کنارهای در رودخانهها خسارتهای زیادی را به اراضی مجاور تحمیل میکند و تغییر ریختشناسی رودخانهها را به همراه دارد. تحقیق حاضر با هدف ارزیابی کارایی علف وتیور در افزایش مقاومت برشی خاک و کاهش فرسایش سواحل رودخانهها صورت گرفته است. تغییرات پارامترهای ساختاری علف وتیور شامل RAR، RDR، RDDI و RLD در اعماق مختلف و همچنین توسعۀ عرضی و عمقی ریشه بررسی شد. با بررسی سه فاصلۀ مختلف بین بوتههای وتیور، فاصلۀ 30 سانتیمتری بین بوتهها به عنوان فاصلۀ بهینه مشخص شد. نتایج نشان داد علف وتیور سبب افزایش بیش از 104 درصدی چسبندگی و حدود 83 درصدی زاویۀ اصطکاک داخلی در مقایسه با حالت بدون ریشه شده است. مقایسۀ بین پارامترهای مختلف نشان داد بهترتیب پارامترهای RAR و RDR مناسبترین پارامتر برای محاسبۀ چسبندگی و زاویۀ اصطکاک داخلی خاک در حضور ریشۀ وتیور هستند. همچنین، با انجام مقایسهای بین وتیور و برخی گونههای درختی منطقه از نظر مقاومت کششی ریشه، مدت زمان لازم برای استقرار گیاه، مقاومت در برابر خشکسالی و قابلیت خودترمیمی مشخص شد که علف وتیور در مقایسه با سایر گونههای گیاهی متداول، مناسبتر است و میتواند به عنوان جایگزین مناسبی برای محافظت سواحل رودخانه در برابر فرسایش استفاده شود. | ||
کلیدواژهها | ||
پوشش گیاهی؛ حفاظت سواحل رودخانه؛ رسوب؛ روش بیولوژیک؛ فرسایش کناره | ||
مراجع | ||
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