Recently, engineers propose longitudinal training walls to replace traditional transverse groynes. This new intervention is expected to maintain a navigation route under low flow conditions while not hampering flow conveyance of the river channel. Navigation occurs mainly in low-land river channels where the formation of alternate bars constitutes a problem which requires mitigation measures like dredging. Le et al. (2015, 2016) found that the starting point of the longitudinal training wall with respect to a steady bar plays an important role on the stability of the bifurcating parallel channels. Starting at a location near the upstream part of the bar leads to side channel silt up. On the contrary, starting at a location near the downstream part of the bar leads to side channel erosion. The most interesting result was that when the longitudinal training wall starts near the bar top, both channels remain open for a long time. However, these results were obtained only for a specific width ratio, ratio between the width of the side and the width of the original channel, B1/B0 = 1/6, under a constant discharge. In practice, the width ratio may vary to obtain specific achievements. Wang et al. (1995) showed that the width ratio plays an important role on the stability of bifurcating channels. So, how the system behaves for different width ratios under variable discharge remains unclear and needs further investigation.
|Publication status||Published - 2017|
|Event||NCR-Days 2017 - Wageningen, Netherlands|
Duration: 1 Feb 2017 → 3 Feb 2017
|Period||1/02/17 → 3/02/17|
|Other||Netherlands Centre for River Studies is a corporation of the Universities of Delft, Utrecht, Nijmegen, Twente and Wageningen, UNESCO-IHE, RWS-WVL and Deltares|