搜索结果: 1-13 共查到“知识库 工学 Soil water”相关记录13条 . 查询时间(0.254 秒)
Survey of soil water distribution in a vineyard and implications for subsurface drip irrigation control
gravimetric water content Sentek Diviner spatio-temporal variability volumetric water content
2016/8/2
Controlling a subsurface drip irrigation system based on soil water monitoring is a very efficient way to supply grapevines with water for optimal thriving and high vintage quality. However, finding a...
Estimation of the soil water retention curve (SWRC) using pedotransfer functions
continuous pedotransfer function soil water retention curve fitting parametric method neural network
2015/1/30
Soil hydraulic characteristics, especially the soil water retention curve and hydraulic conductivity, are essential for many agricultural, environmental, and engineering applications. Their measuremen...
ASSESSMENT OF EARLY SEASON AGRICULTURAL DROUGHT THROUGH LAND SURFACE WATER INDEX (LSWI) AND SOIL WATER BALANCE MODEL
LSWI NDVI Soil Water Balance Area Conducive for Sowing
2014/5/6
An attempt was made to address the early season agriculture drought, by monitoring the surface soil wetness during 2010 cropping seasons in the states of Andhra Pradesh and Tamil Nadu. Short Wave Infr...
覆膜开孔蒸发条件下土体高度对水盐运移的影响（Effects of Soil Column Heights on Movement of Soil Water and Soil Salt-during Evaporation under Perforated Plastic Mulch）
覆膜开孔率 土体高度 单位深度累积蒸发量
2010/12/29
通过不同高度土体在不同覆膜开孔率条件下的室内蒸发试验，研究了土体高度变化时水盐分布的差异与相互联系。试验结果表明，不同高度土体的单位深度累积蒸发量与时间变化符合Gardner理论关系，单位深度累积蒸发量与时间和土体总高度存在二元线性函数关系；单位深度累积蒸发量和单位膜孔面积单位深度累积蒸发量均与土体高度和覆膜开孔率存在较好的函数关系；土体高度越小，单位深度含盐量和盐分浓度变化幅度越大，土体高度是影...
黄土区农草混合利用坡面土壤水分空间变异性（Spatial Variability of Soil Water Content on a Cropland-grassland Mixed Slope Land in the Loess Plateau, China）
土壤水分 农草混合结构 空间变异性
2010/12/29
通过对黄土区农草混合利用坡面的土壤水分分析，研究土地利用结构对土壤水分空间变异特性的影响。结果表明，研究区坡面土壤水分呈中等变异，且农草混合利用结构明显增加了土壤水分的空间变异强度，坡面土壤水分具有明显空间结构性。干湿条件下坡面0～60cm土层平均含水率的半方差最优理论模型分别为高斯模型和球状模型，且干旱条件较湿润条件下保持较高的基台值和变程，而块金值/基台值相对较低。Kriging插值结果显示...
土壤斥水性影响因素及改良措施的研究进展（Influencing Factors and Amelioration of Soil Water Repellency）
土壤斥水性 影响因素 改良措施
2010/12/28
论述了森林火灾、土壤含水率、有机质含量、pH值、生物膜和粘土矿物质等因素对土壤斥水性的影响以及国内外土壤斥水性改良措施的研究进展，并提出当前土壤斥水性研究的重点和今后的研究方向是土壤毛孔或粒子范围方面的研究、土壤含水率和斥水性的表达、大范围田间斥水性对不同水文学要素的定量影响，同时指出国内土壤斥水性的研究发展方向。
微咸水入渗水量对土壤水盐运移特征的影响（Effect on Characteristics of Soil Water and Salt Movement about Saline Water Infiltration with Different Infiltration Amount）
微咸水 含水率 含盐量 脱盐效率
2010/12/28
通过室内3g/L微咸水的入渗试验，分析了不同微咸水入渗水量对土壤剖面含水率、含盐量、脱盐效率和阳离子分布的影响。结果表明，利用3g/L的微咸水进行垂直一维积水入渗，入渗水量较小时，基质势是水分运动的主要动力，入渗量继续增大时，重力势逐渐取代基质势成为水分运动的主要动力；采用3g/L的微咸水入渗，可以使上层土壤脱盐，但使湿润锋处的含盐量急剧增加且达到最大值；湿润锋处含盐量与入渗水量符合指数函数...
Phytoextraction of Metal Contaminants by Typha Angustifolia: Interaction of Lead and Cadmium in Soil-Water Microcosms
Phytoextraction Contaminant Interaction Lead Cadmium Microcosm Typha Angustifolia
2013/3/13
A greenhouse study was conducted on phytoextraction and accumulation of lead (Pb) and cadmium (Cd) from contaminated soil – water microcosms by the narrow-leaved cattail, Typha angustifolia. The plant...
蓄水多坑入渗条件下土壤水分运动建模与试验（Numerical Simulation on Soil Water Movement under Water Storage Pits Irrigation）
土壤水分运动 三维入渗 数值模拟 蓄水坑灌
2010/4/1
针对蓄水坑灌坑内水头高且非恒定和土壤入渗边界复杂的特点，建立了蓄水多坑三维入渗及土壤水分运动数学模型，采用ADI交替方向隐式差分格式结合Gauess-Seidel迭代法对模型进行求解，并进行了试验验证，结果表明计算值与实测值吻合较好，说明所建立的数学模型正确，采用的数值求解方法是可行的。 Aimed at the specialties of infiltration head higher an...
测量土壤水分特征曲线的复合传感器设计（Design of Dual-sensor for Measuring Soil Water Characteristic Curve）
土壤 含水率 水吸力
2009/8/11
为了直接获取土壤水特征曲线，在一种商品化微型张力计的基础上，设计了一种同步测量土壤水吸力与容积含水率的复合传感器。将张力计中的一段金属保护套管作为天线，利用其辐射阻抗随着土壤含水率变化的规律来测量土壤容积含水率。在实验室环境下，利用3种不同质地土样(砂土、砂壤土、粘壤土)对复合传感器进行了试验，并与经典土壤水特征曲线测量方法（压力锅法结合砂箱法）获得的数据进行了比较。结果表明，复合传感器在3种土壤...
乔灌篱沟蓄沟道土壤水分运动数值模拟（Numerical Simulation for Soil Water Movement of Gutter under Water Conservation in Arbor-shrub-hedge-gutter）
乔灌篱沟蓄 土壤水分运动 有限元
2009/8/11
在分析乔灌篱沟蓄沟道布置和水分运动特点的基础上，建立了乔灌篱沟蓄沟道二维非饱和土壤水分运动模型，采用Galerkin有限单元法对方程进行数值求解。室内验证试验结果表明，土壤含水率和湿润锋的模型计算值与实测值吻合较好，说明乔灌篱沟蓄沟道土壤水分运动模型正确，采用有限元法求解可行。
Relationship Between Shear Strength and Soil Water Characteristic Curve of an Unsaturated Granitic Residual Soil
Matric suction shear strength
2009/3/19
Shear strength parameters are crucial for stability analyses of slopes against slope failures and landslides. The three shear strength parameters that are required to define a failure envelope of an u...
Calibration and Simultaneous Monitoring of Soil Water Content and Salinity with Capacitance and Four-electrode Probes
Dielectric probe four-electrode probe calibration salinity water content
2009/2/5
Non-destructive monitoring of soil water content (W) and the electrical conductivity of the soil solution (ECw) has been desired for environmental evaluation and sustainable agriculture. Dielectric pr...