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سعیده بردسیری زاده عیسی اسفندیارپور بروجنی علی اصغر بسالت پور پیمان عباس زاده دهجی

چکیده

خاکدانه به¬عنوان واحد ساختمانی خاک، بیانگر مجموعه¬ای از ذرات اولیه است که پیوستگی¬شان به یکدیگر بیش از پیوستگی آن‏ها به ذرات خاک اطراف این مجموعه می¬باشد. هدف از پژوهش حاضر، تعیین مهمترین جزء اندازه¬ای خاکدانه¬ (درشت و یا ریز) در برآورد میزان پایداری ساختمان خاک در منطقه¬ی رابر کرمان با بهره¬گیری از زمین¬آمار می¬باشد. تعداد 90 نمونه¬ی خاک سطحی (10-0 سانتی¬متر) به روش شبکه¬ای منظم و با فواصل تقریبی 200 متر، از منطقه برداشت و هواخشک شد. پس از عبور نمونه¬ها از الک چهار میلی‌متری، درصد پایداری خاکدانه¬ها در سه بخش خاکدانه¬های کل، درشت و ریز در دو حالت خشک و مرطوب محاسبه شد. سپس، مطالعات زمین¬آماری شاخص¬های پایداری محاسبه¬شده، در قالب دو مرحله¬ی واریوگرافی و تخمین انجام گرفت و نقشه¬های کریجینگ پایداری خاکدانه¬ها ترسیم شد. به¬منظور تعیین میزان همخوانی نقشه¬های کریجینگ شاخص پایداری محاسبه¬شده برای خاکدانه¬های درشت و ریز با شاخص محاسبه¬شده برای کل خاکدانه¬ها، پس از تشکیل ماتریس خطا، صحت عمومی آن¬ها محاسبه شد. براساس نتایج حاصل،بیش‏ترین درصدپایداری کل خاکدانه¬ها (9/89 درصد) در موقعیت¬های شمال و جنوب¬شرقی منطقه¬ که بیش‏ترین مقدار ماده¬ی آلی (2/3 درصد) را به خود اختصاص داده بودند، در حالت خشک دیده شد. درصد صحت عمومی حاصل از تقاطع نقشه¬های کریجینگ کل خاکدانه¬ها و خاکدانه¬های درشت در حالت خشک (75/51 درصد)، بیش از حالت مرطوب (17/32درصد) بود. در مقابل، درصدصحت عمومی محاسبه-شده برای تقاطع نقشه¬های کریجینگ کل خاکدانه¬ها و خاکدانه¬های ریز در حالت مرطوب (31/17 درصد)، بیش از حالت خشک (93/10 درصد) بود. به-طور کلی، مطالعه¬ی تغییرات مکانی پایداری خاکدانه¬های درشت و ریز می¬تواند در راستای مدیریت بهینه¬ی اراضی برای مطالعات آتی مفید واقع شود.

جزئیات مقاله

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ارجاع به مقاله
بردسیری زادهس., اسفندیارپور بروجنیع., بسالت پورع. ا., & عباس زاده دهجیپ. (2016). تعیین مؤثرترین جزء خاکدانه در برآورد پایداری ساختمان خاک با بهره گیری از روش زمین آمار. آب و خاک, 31(2), 533-544. https://doi.org/10.22067/jsw.v31i2.54438
نوع مقاله
علمی - پژوهشی