Temporal and Spatial Thermal Radiation Distribution Analysis within and above Crop Canopies by 3D Simulation
نویسندگان
چکیده
The thermal radiation distribution within and above the canopy is explored. CUPID model is chosen to simulate the canopy component temperatures. TRGM model, based on 3D realistic structure and radiosity solution, is used to simulate the component brightness temperature distribution within canopy and thermal radiation emission directionality distribution TB (θ) above canopy. It is noted that the shape of vegetation component temperature profile mostly like an inverse “S” curve. Component temperature histogram is very good indicator to show daily variation. The difference between component brightness temperature and thermodynamic temperature mainly varies with LAI, relative height and leaf angle distribution. Through establishing relationship between TB (θ) variation, LAI and environmental parameters on crop canopies, the temporal effects or angular effects of the thermal radiation distribution is discussed.
منابع مشابه
Spatio-temporal variation of wheat and silage maize water requirement using CGMS model
The Crop Growth Monitoring System (CGMS) has been applied for spatial biophysical resource analysis of Borkhar & Meymeh district in Esfahan province, Iran. The potentially suitable area for agriculture in the district has been divided into 128 homogeneous land units in terms of soil (physical characteristics), weather and administrative unit. Crop parameters required in the WOFOST simulatio...
متن کاملA deterministic method to characterize canopy radiative transfer properties
Investigations of snowcover dynamics beneath vegetation canopies require either measured or estimated solar and thermal radiation values at the snow surface. A deterministic method is presented that uses portable arrays of pyranometers and pyrgeometers to quantify the amount of incoming radiation at the snow surface. Example solar and thermal radiation datasets are presented from boreal deciduo...
متن کاملThe influence of respiratory motion on dose distribution of 3D-CRT and IMRT- A simulation study
Background: 3DCRT (three-dimensional conformal radiotherapy) and IMRT (intensity-modulated radiotherapy) has provided us with tools to delineate the radiation dose distribution of tumor targets. However, the precision of radiation can be compromised by respiratory motion, which usually limits the geometric and dosimetric accuracy of radiotherapy. The purpose of this study is to evaluate the imp...
متن کاملNumerical simulation of a three-layered radiant porous heat exchanger including lattice Boltzmann simulation of fluid flow
This paper deals with the hydrodynamic and thermal analysis of a new type of porous heat exchanger (PHE). This system operates based on energy conversion between gas enthalpy and thermal radiation. The proposed PHE has one high temperature (HT) and two heat recovery (HR1 and HR2) sections. In HT section, the enthalpy of flowing high temperature gas flow that is converted to thermal radiation em...
متن کاملAn Initiative Plan of the Equivalent Model for Simulation of the Welding Process
Many researchers content themselves with the 2D simulation of welding process instead of the 3D simulation, because of the time and the cost factors of the latter. In this research, the number of elements and nodes are reduced by an initiative plan (defining an equivalent model) for the simulation of welding. The welding process has been simulated by an uncoupled thermal-mechanical finite eleme...
متن کامل