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基于椭球函数的棉花叶倾角分布动态模拟（Dynamic Simulation of Leaf Inclination Angle Distribution Based on Ellipsoidal Function）
棉花 叶倾角分布 椭球函数 动态模拟
2009/5/22
根据试验资料，在系统分析棉花冠层叶倾角时空分布规律的基础上，将整个生育期分为4个生长阶段，并利用高斯五点距离法将冠层分为5层，用椭球分布函数模拟不同生育阶段、不同高度层上的叶倾角分布密度。模型能较全面地反映整个生育期冠层不同高度上的叶倾角分布情况，且方便用于分层的光合作用模型。利用不同播期的试验资料对模型进行验证，叶倾角频率分布的模拟结果与1∶1直线之间的决定系数R2和均方根误差（RMSE）分别为...
Attempt to use the SWATREZ and UNDYS models for the simulation of ground water pollution in agrosystems irrigated by municipal sewage
modelling waste water ground water nitrogen hydromorphic soil
2008/12/2
For the simulation of water movement and pollutant transport in the hydromorphic soil profile two numerical models SWATREZ and UNDYS were used. These models are based on water movement in porous mater...
Analysis of the shear behaviour of a grain assemblyusing dem simulation
grain assembly shear behaviour numerical simulation Discrete Element Method
2008/11/26
Shear behaviour of a grain assembly in a shear box under the condition of no externally applied load was investigated numerically using the Discrete Element Method. The assembly was a monodisperse sys...
Mathematical simulation of soil cloddiness
soil mechanics clods cracking size distribution mathematical simulation
2008/11/14
A theoretical model was developed to predict soil clod size distribution attained after tillage so that it can be taken as initial state of soil for following erosion processes. The model was develope...
Simulation of the soil water regime for grassland irrigation
water flow in soil evapotranspi ration crop production irrigation predicted
2008/11/12
The principle aim of this study was to develop a model to predict the water processes under growing grass. This paper includes: the GRAGRO model simulates the vertical flow in an unsaturated homogeneo...
Two approaches to the description of distribution keys in crop simulation models
dynamic model plant development physiological age dry matter distribution keys
2008/11/11
Distribution keys are used in crop models for the description of assimilates partitioning between several plant organs. Standard approach is to use table data for discrete points as functions of a phy...