| Popis: |
Furrow irrigation, the most common irrigation method in California, can be difficult to manage efficiently because of lack of quantitative information on infiltration rates. Conventional methods of measuring infiltration rates are not likely to be used on routine evaluations of furrow irrigation system. However, volume-balance simulation models of furrow irrigation, which estimate infiltration from water advance data, offer a potential for estimating infiltration in furrows. Six models were evaluated using detail data from 200 furrow evaluations. Results showed an inverse relationship between the exponent of the power advance equation and the exponent of the infiltration equation. This relationship tended to cause the models to greatly underestimate cumulative infiltration as the advance exponent approach unity. The models ability to predict system performance under different flow rates given an initial flow rate was also investigated. |
