ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

It is difficult to measure water distribution for sprinkler irrigation on sloping land. Based on the formula for calculating sprinkler range on sloping land, according to the principle of water balance along spray direction, a calculated model for transforming sprinkler water distribution from flat ground into sloping land was proposed and validated by an experiment. The effects of sprinkler layout, sprinkler spacing, operating pressure and slope on sprinkler water distribution on sloping land were analyzed by using the model. The results showed that water distribution for the sprinkler triangular arrangement was more uniform than that for square layout, and the combined sprinkler irrigation water application uniformity for the sprinkler triangular arrangement was slightly higher than that for square layout. The combined sprinkler irrigation water application uniformity was decreased with the increase of sprinkler spacing. When the sprinkler was operated at low pressure, the combined sprinkler irrigation water application uniformity was relatively low, and the low uniformity cannot meet the requirement of sprinkler irrigation uniformity. The combined sprinkler irrigation water application uniformity was increased with the increase of sprinkler pressure. The effect of slope on water distribution and the combined sprinkler irrigation water application uniformity was insignificant within a certain slope. Therefore, if the Rainbird LF1200 sprinkler was used in the sprinkler irrigation system design on sloping land, it was recommended that the sprinkler spacing should be 1.0~1.2 times as the spraying range on flat ground with the triangular arrangement, and the sprinkler operating pressure should be 300kPa.