Abstract
The research included studying the effect of the slope of soil surface on water distribution uniformity of stationary sprinkler systems. 30 tests were conducted to obtain the pattern of water distribution along the radius of the wetting circle, where the sprinkler at the center, using 6 different sprinklers heads. In addition, different slopes of the surface were considered to study the wetting pattern, obtained by calculating the vertical deflection from the sprinkler head riser. 420 patterns of field water distribution were found for five slopes of the ground surface at seven different spacing, using rectangular and triangular arrangement of six sprinkler heads. It has been concluded that both of the uniformity coefficient CU and the distribution coefficient DU decrease with the increase of the soil surface slope, (87.5% and 89% of the cases respectively). In addition, The mean percentages of maximum decrease in UC and DU due to the gradient increase from 0% to 20% for all sprinkler heads was 3.17% and 6%, respectively.and the pattern of the water distribution does not change with the change of the soil surface slope, but rather the depth of water decreases and the range of the spraying increases as the negative slope decreases, and vice versa, the rate of water depth increases and the range of spraying decreases as the positive slope increases. Two equations were concluded to calculate the uniformity coefficient CU (or the distribution coefficient DU) for the distribution of water spray over lands with different slopes as a function of the slope and the uniformity coefficient CU (or the distribution coefficient DU) for the distribution of the water spray on flat surfaces with coefficients of determination of 0.98 and 0.977, respectively.
Highlights
.2.3تأثير انحدار الارض على معامل التناسق UC توضح الجداول( )7-2قليم معاملل التناسلق CUللفواصلل ( 6م*6 م) و ( 8م* 8م) و ( 6م* 12م) و ( 8م* 12م) و ( 8م* 16م) و ( 12م* 12م) و ( 12م* 16م) ولحلللللللالتي الترتيلللللللب الربلللللللاعي والثلاىي بيأ المرشات عند انحلدارات سلطح الأرض %0و %5 و %10و %15و %20وعلي الت[[[[[[[[[والي لرمول المرشات المسللللتخدمة فللللي الدراسللللة Atakو Gardenaو Weatherو Neptuneو Rain Birdو .Maxi Birdعاملةً يتبليأ ملأ هل ه الجلداول ان معاملل التناسلق يقلل مل ادديلاد انحلدار سلطح الارض حيللث يمثللل هلل ا %94مللأ حللالات ت يللر معامللل التناسللق عنللد انحلللدارات مختلفلللة لسلللطح الارض .وفلللي هللل ه الجلللداول يتبلللايأ النقصان في معامل التناسلق مل ديلاد انحلدار سلطح الارض بقلا
يتبليأ ملأ هل ه الجلداول ان معاملل تناسلق التوديل DUيقلل مل ادديلاد انحلدار سلطح الارض حيلث يمثلل هل ا %94ملأ حلالات ت يلر معاملل التناسلق عنلد انحلدارات مختلفلة لسلطح الارض .وفلي ه ه الجداول يتبلايأ النقصلان فلي معاملل تناسلق التوديل DUمل ديللاد انحللدار سللطح الارض بقللا لاخللتلاف رمول المرشللات والفواصل بيأ المرشات وترتيبهلا ولتوضليح ذلل يعلرض الجلدول ( )15النسللللبة المئويللللة لأقصللللي نقصللللان فللللي معامللللل تناسللللق التودي % DUنتيجة دياد انحدار الارض مأ %0اللي قصلي قيمة .%20ويتبيأ مأ الجدول علي نسبة مئويلة لأقصلي نقصلان
Summary
الشدكل :)6نمدط توزيدع المداء لدرأس المر دة المفدرد ونمدط التوزيع الحقلي بالترتيبين الرباعي و الثلاثدي للمر دات بفاصدلة 8م*8م للمر دددة ندددوع GARDENAأرض ذات انحددددار 10
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