مدل سازی نقش پوشش و اندازه سنگریزه سطحی بر تولید رسوب با استفاده از روش پاسخ سطح

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه علوم خاک، دانشگاه ارومیه (مکاتبه کننده)

2 دانشجوی کارشناسی ارشد گروه علوم خاک، دانشگاه ارومیه

3 دانشیار گروه علوم خاک، دانشگاه ارومیه

چکیده

سنگریزه
سطحی عاملی مهم در کنترل مقدار فرسایش خاک به­ویژه در اراضی شیب­دار مناطق خشک و
نیمه­خشک است که مدل­سازی نقش آن در فرسایش خاک، پیچیدگی­های فراوانی دارد. هدف از
این مطالعه مدل­سازی تاثیر همزمان دبی جریان سطحی، پوشش و همچنین ابعاد سنگریزه­های
سطحی بر غلظت رسوب با استفاده از روش پاسخ سطح و بر مبنای طرح مرکب مرکزی بود.
آزمایش­ها در دو سری مجزا و در شیب ثابت 5 درصد انجام شد. مدل بر اساس نتایج سری
اول آزمایش­ها ایجاد و با استفاده از نتایج آزمایش­های سری دوم، اعتبارسنجی شد. یافته­ها
بیانگر کارآمدی بالای (
gl-1­6/1= RSME و 943/0= R2) مدل طرح مرکب مرکزی در برآورد غلظت رسوب
مشاهده­ای از آزمایش­های سری اول بود. اعتبارسنجی مدل نیز بیانگر کارایی بالای مدل
(
gl-1­6/3= RSME و 895/0=
R2) برای دامنه تغییرات وسیعی از ویژگی­های
اولیه بود. بر مبنای نتایج آزمایش­ها، افزایش درصد سنگریزه سطحی در محدوده­ی صفر
تا 45 درصد سبب کاهش غلظت رسوب شد با این حال اثر سنگریزه­های ریزتر در کاهش غلظت
رسوب در مقایسه با سنگریزه­های درشت­تر بیشتر بود.

کلیدواژه‌ها


عنوان مقاله [English]

Modeling of the effect of rock fragment cover and sizes on the sediment concentration using response surface method

نویسندگان [English]

  • Farrokh Asadzadeh 1
  • Mohiaddin Fegh-Hassan-Agha 2
  • Habib Khodaverdiloo 3
1 Assistant Professor, Department of Soil Science, Urmia University, Iran
2 M.Sc. Student, Department of Soil Science, Urmia University, Iran
3 Associate Professor, Department of Soil Science, Urmia University, Iran
چکیده [English]

Surface rock fragment is one of the most important factors controlling soil erosion especially in hillslopes of arid and semiarid regions where, modeling of its effects on soil erosion has a great complexity. This study aims to model the interactive effects of surface runoff, rock fragment cover and rock fragments size on the sediment concentration using the response surface method according to the central composite design. Two sets of experiments were carried out on a fixed bed slope of 5 percent. The first set of experiments used to develop the predictive model based on central composite design and the second set of the experiments were applied to validate the model. The results of first data set indicated the high efficiency (R2= 0.934 and RMSE=1.6 gl-1) of the predictive model of sediment concentration. The model validation with the second set of data also indicated a good agreement (R2= 0.895 and RMSE=3.6 gl-1) between the predicted values of sediment concentration and the experimental values with a wide range of independent variables. From the modeling approach and experimental data it could be concluded that the sediment concentration decreases as the rock fragment cover at the soil surface increases in the range of 0 to 45 percent. However the efficiency of the small rock fragments in decreasing the sediment concentration is higher than the coarse rock fragments.

کلیدواژه‌ها [English]

  • Sediment concentration
  • Surface rock fragment
  • Run-on simulation
  • Central composite design
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