Head ditch hydraulics and the variability of inflows to irrigation furrows
Article
Article Title | Head ditch hydraulics and the variability of inflows to irrigation furrows |
---|---|
ERA Journal ID | 4213 |
Article Category | Article |
Authors | Smith, R. J. (Author) and Gillies, M. H. (Author) |
Journal Title | Irrigation and Drainage |
Journal Citation | 59 (4), pp. 442-452 |
Number of Pages | 11 |
Year | 2010 |
Publisher | John Wiley & Sons |
Place of Publication | United Kingdom |
ISSN | 0971-7412 |
1531-0353 | |
1531-0361 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/ird.495 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/full/10.1002/ird.495 |
Abstract | The spatial variability and temporal variation of furrow inflows have a major impact on the performance of furrow irrigation, as indicated by the usual measures of application efficiency and uniformity. They also cause difficulties in determining the soil infiltration characteristic through inverse solution techniques and in selecting preferred values for the operational variables of flow rate and time to cut-off to give maximum performance at the field scale. In this paper a steady spatially-varied flow analyses is performed to predict the steady water surface profiles in a typical head ditch and the subsequent spatial variability of the furrow inflows, for both pipe or siphon and sill or bank-less type water application systems. The resulting patterns were very similar to those seen in the spatially varied pipe flow in gated pipe, with depths and outflows increasing toward the downstream end of the channel. It is shown that it is feasible to design head ditches to minimise the variability in outflows. An unsteady analysis of the same head ditch illustrated the variation of outflows with time caused by the time taken to fill the channel. |
Keywords | unsteady flow; steady spatially-varied flow; furrow irrigation; siphon |
ANZSRC Field of Research 2020 | 300207. Agricultural systems analysis and modelling |
409901. Agricultural engineering | |
300201. Agricultural hydrology | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | National Centre for Engineering in Agriculture |
https://research.usq.edu.au/item/q0228/head-ditch-hydraulics-and-the-variability-of-inflows-to-irrigation-furrows
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