پديد آورنده :
ناطقي نيا، سميه
عنوان :
تاثير شيب زمين و پوشش گياهي بر ذخيره سطحي و رواناب در خاك هاي درز و شكاف دار در آبياري باراني
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
آبياري و زهكشي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
سيزده، 117، [II] ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
بهروز مصطفي زاده مهر، فرهاد موسوي
استاد مشاور :
اسدالله محسني موحد، اسماعيل لندي
توصيفگر ها :
پاشش آبپاش ها , لوم رسي , اراك
تاريخ نمايه سازي :
18/04/87
تاريخ ورود اطلاعات :
1396/03/03
چكيده فارسي :
به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
Abstract Since Iran is located in a region with low rainfall it is necessary to use irrigation systems with high performance In recent years due to low rainfall and shortage of water the government paid especial attentions to improve irrigation systems and to use new methods of irrigation especially sprinkler irrigation systems For sprinkler irrigation systems usually the soil basic intake rate is used to determine the maximum sprinkler discharge rate and irrigation time Surface runoff and irrigation efficiency are influenced by soil infiltration In each irrigation some water can be stored at soil surface without runoff The soil surface storage depends on slope crop coverage and roughness Surface storage has important influence on runoff and infiltration In cracking clay soils with reduction of soil moisture cracks are developed whitch cause problems for infiltration and irrigation performance In this study the effects of slope crop coverage and soil cracks on surface storage and runoff under typical sprinkler irrigation system were studied The experiments were conducted on a farm with classic sprinkler irrigation system at Markazy province Two soil treatments one ordinary soil with clay loam texture and another one a cracking soil with silty clay loam texture was used The experiments were conducted with and without plants under three slopes of 1 3 and 5 with three replications The experiment was complete randomized design The statistical software of SAS was used to analyze data To collect runoff a metal frame with dimension of 2m by 2m and height of 20 cm was used The frame was placed at the center of each experimental plot 25 m by 26 m and pushed about 10 cm into the soil Four sprinklers were placed at outside corners of the frame At the downstream end of the frame a container with volume of about 0 1 m3 was placed below the soil surface to collect runoff The volume balance method was used to compute surface storage The results showed that slope and crop coverage have significant effects on runoff and surface storage The effects of soil cracks on surface runoff were not significant The increase in slope from 1 to 5 caused the runoff to increase from 34 7 to 43 3 The effects of slope on surface storage was negative For ordinary soil without crop the increase in slope from 1 to 5 caused the depth of surface storage to decrease from 0 97 cm to 0 58 cm the effects of crop coverage on runoff was higher as compared to the effects of soil cracks The crop coverage caused 10 reduction in runoff For sprinkler irrigation systems The use of ring infiltrometer to measure soil infiltration is not recommended because ring infiltrometer showed higher infiltration pdfMachine A pdf writer that produces quality PDF files with ease Produce quality PDF files in seconds and preserve the integrity of your original documents Compatible across nearly all Windows platforms if you can print from a windows application you can use pdfMachine Get yours now
استاد راهنما :
بهروز مصطفي زاده مهر، فرهاد موسوي
استاد مشاور :
اسدالله محسني موحد، اسماعيل لندي
