A new method is proposed to calculate the cross-sectional flow field in compound channels for 1D flow models. The proposed method involves a new parameterization of the interface stress between adjacent compartments, typically between the main channel and floodplain of a two-stage channel. This expression, proportional to the difference in squared velocities allows for a simple calculation of the average flow velocities in different compartments. For two-stage channels good agreement is found between the model results and data from literature. Also, it is shown that the description of compartment-averaged velocities may be applied to flows in channel cross-sections with arbitrary geometry, thus providing a potentially useful improvement to 1D river flow models.
|Title of host publication||5th International Symposium on Environmental Hydraulics (ISEH)|
|Subtitle of host publication||4-7 December 2007, Arizona State University, Tempe, AZ, USA|
|Editors||D. Boyer, O. Alexandrova|
|Publisher||Arizona State University / IAHR|
|Number of pages||6|
|Publication status||Published - 4 Dec 2007|
|Event||5th International Symposium on Environmental Hydraulics, ISEH 2007 - Tempe, United States|
Duration: 4 Dec 2007 → 7 Dec 2007
Conference number: 5
|Conference||5th International Symposium on Environmental Hydraulics, ISEH 2007|
|Period||4/12/07 → 7/12/07|
Huthoff, F., Roos, P. C., Augustijn, D. C. M., & Hulscher, S. J. M. H. (2007). A new method to account for large scale mixing-processes in spatially-averaged flow models. In D. Boyer, & O. Alexandrova (Eds.), 5th International Symposium on Environmental Hydraulics (ISEH): 4-7 December 2007, Arizona State University, Tempe, AZ, USA (pp. 1-6). Arizona State University / IAHR.