Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | E83-10426, NASA-CR-173056, CP-53-04417, NAS 1.26:173056 |
| 来源ID | NTRS_Document_ID: 19830026140 |
| The continuous similarity model of bulk soil-water evaporation | |
| Clapp, R. B. | |
| 英文摘要 | The continuous similarity model of evaporation is described. In it, evaporation is conceptualized as a two stage process. For an initially moist soil, evaporation is first climate limited, but later it becomes soil limited. During the latter stage, the evaporation rate is termed evaporability, and mathematically it is inversely proportional to the evaporation deficit. A functional approximation of the moisture distribution within the soil column is also included in the model. The model was tested using data from four experiments conducted near Phoenix, Arizona; and there was excellent agreement between the simulated and observed evaporation. The model also predicted the time of transition to the soil limited stage reasonably well. For one of the experiments, a third stage of evaporation, when vapor diffusion predominates, was observed. The occurrence of this stage was related to the decrease in moisture at the surface of the soil. The continuous similarity model does not account for vapor flow. The results show that climate, through the potential evaporation rate, has a strong influence on the time of transition to the soil limited stage. After this transition, however, bulk evaporation is independent of climate until the effects of vapor flow within the soil predominate. |
| 英文关键词 | EVAPORATION HYDROLOGY MODELS SOIL MOISTURE AGRISTARS PROJECT DRYING EARTH RESOURCES EARTH RESOURCES PROGRAM EVAPORATION RATE MATHEMATICAL MODELS METEOROLOGICAL PARAMETERS MOISTURE CONTENT VAPOR PHASES |
| 出版年 | 1983 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| URL | http://hdl.handle.net/2060/19830026140 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/258962 |
| 推荐引用方式 GB/T 7714 | Clapp, R. B.. The continuous similarity model of bulk soil-water evaporation,1983. |
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