1) gravity subsurface drip irrigation
重力式地下滴灌
1.
Based on the theory of unsaturated soil water dynamics,a three-dimensional axisymmetric model is set up to simulate soil water movement under gravity subsurface drip irrigation(SDI).
基于非饱和土壤水动力学理论,建立了重力式地下滴灌条件下土壤水分运动轴对称三维数值模拟模型,利用Galerkin有限元法进行了数值模拟。
2.
Based on the unsaturated soil water movement theory, a soil-water movement mathematical model is set up under gravity subsurface drip irrigation(SDI),a finite element equation with Galerkin finite element method for the model is inferred,and it is testified with experiments.
基于非饱和土壤水运动理论,建立了重力式地下滴灌条件下土壤水分运动数学模型,用Galerkin有限元法推导了重力式地下滴灌土壤水分运动有限元方程,并通过试验进行了验证,在此基础上模拟分析了中壤土条件下的滴灌管道埋深、出水孔孔径、供水压力对简易重力式地下滴灌土壤湿润特征和滴孔出水量的影响。
2) removable subsurface drip-irrigation
移动式地下滴灌
1.
On the foundation of summarizing the advantage and the weakness of different forms in drip-irrigation,we have invented a new kind of removable subsurface drip-irrigation system which can be used in resisting drought for the tobacco,the vegetables and other similar non-close planting cultivated crops in the area of droughty massif.
在总结不同滴灌形式优缺点的基础上,开发出一种新型移动式地下滴灌装置。
3) subsurface drip irrigation
地下滴灌
1.
Effect of treflan injection on root growth and yield of winter wheat under subsurface drip irrigation;
冬小麦地下滴灌氟乐灵注入制度对根系生长及作物产量影响的试验研究
2.
Research progress on appropriate depth and interval of lateral pipes in subsurface drip irrigation;
地下滴灌毛管适宜埋深及间距研究进展
3.
Study on effects of irrigation frequency on soil water-transport of line source permeation under subsurface drip irrigation;
灌水频率对地下滴灌线源入渗土壤水分运动规律影响的试验研究
4) Underground drip irrigation
地下滴灌
1.
In this paper,suitable buried depth and irrigation water quantity of underground drip irrigation in clover field are researched according to the soil moisture change of underground drip irrigation of clover field,through comparison with that of conventional furrow irrigation.
根据苜蓿地下滴灌土壤水分变化 ,并以常规沟灌为对照 ,对苜蓿田间地下滴灌的适宜埋深和灌水量进行了研究。
6) Subsurface drip irrigation(SDI)
地下滴灌(SDI)
补充资料:重力式挡土墙
重力式挡土墙
gravity retaining wall
建筑中,由于设置闸门或水流等条件限制,挡土墙墙面常需做成铅直面,故多采用俯斜式(图1)。 挡土墙常用砌石或混凝土建造。为了改善基底压力状态,常将基础宽度适当扩大,两端向外伸出,使基底压力减小并力求分布接近均匀。重力式挡土墙可就地取材,施工简单。由于其体积和重量较大,建筑高度往往受地基容许承载力的限制,即使地基承载力允许,过高将耗费较多材料,也不经济,故常在挡土高度5一6米以下时采用。当墙高超过5一6米时,常将墙身局部挖空代之以填土,也可做成有减压台的衡重式挡土墙(图2)或半重力式挡土墙,借以节约材料。衡重式挡土墙由直墙、减压台与底脚3部分组成,其特点是利用减压台支承上部填土,以减小减压台以下墙背所受的土压力,有助于挡土墙的稳定,同时使基底压力分布均匀。半重力式挡土墙是将重力式墙身断面缩小,基底放宽,既减小基底压力,也节省混凝土,减压台底脚图2衡重式档土墙而在局部拉应力较大处配置少量钢筋。重力式挡土墙墙后及墙身常需设置排水设备,并每隔一定距离设伸缩沉陷缝。如有防渗要求,缝内应设止水。 (陈德亮)zhonglishi da重力式挡土竖u吧ng徊LgraVILy fetalnlllg Wall)主要依靠自重维持稳定的挡土结构。是挡土墙最常用的型式之一。一般做成简单的梯形断面。根据墙背的坡度,重力式挡土墙分为仰斜、垂直及俯斜3种型式。挖方处的挡土墙,一般作成仰斜式,施工方便,土压力较小,墙身截面比较经济;填方处的挡土墙,墙背需回填土,常采用俯图l斜式和垂直式,使填土易于夯实。重力式挡土墙在水闸等一些水工
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