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Baar, A.W. (author), de Smit, Jaco (author), Uijttewaal, W.S.J. (author), Kleinhans, Maarten G. (author)Large-scale morphology, in particular meander bend depth, bar dimensions, and bifurcation dynamics, are greatly affected by the deflection of sediment transport on transverse bed slopes due to gravity and by secondary flows. Overestimating the transverse bed slope effect in morphodynamic models leads to flattening of the morphology, while...journal article 2018
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Patil, A. (author), Mudiyanselage, Sanduni Disanayaka (author), Bricker, J.D. (author), Uijttewaal, W.S.J. (author), Keetels, G.H. (author)Sliding force and punching pressure were contributing factors to widespread breakwater damage caused during the 2011 Great East Japan Tsunami (Takagi and Bricker, 2015), and were dominant factors causing displacement of caissons from the world’s deepest breakwater: the Kamaishi bay-mouth composite tsunami breakwater (Arikawa et al., 2012;...journal article 2018
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Le, T.B. (author), Crosato, A. (author), Mosselman, E. (author), Uijttewaal, W.S.J. (author)To maintain a navigable channel and improve high-flow conveyance, engineers have recently proposed constructing longitudinal training walls as an alternative to the traditional transverse groynes. However, previous work has shown that the system of parallel channels created by a longitudinal training wall might be unstable in rivers with...journal article 2018
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Le, T.B. (author), Crosato, A. (author), Uijttewaal, W.S.J. (author)Rivers have been trained for centuries by channel narrowing and straightening. This caused important damages to their ecosystems, particularly around the bank areas. We analyse here the possibility to train rivers in a new way by subdividing their channel in main and ecological channel with a longitudinal training wall. The effectiveness of...journal article 2018
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Broekema, Y.B. (author), Labeur, R.J. (author), Uijttewaal, W.S.J. (author)Scour in the vicinity of a hydraulic structure may compromise its geotechnical stability or that of nearby structures. Much fundamental research has been dedicated to the understanding and prediction of these processes, in order to enable the efficient design of mitigation measures. While most of these efforts consider laterally uniform flows,...journal article 2018
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van Linge, B.W. (author), Mosselman, E. (author), van Vuren, S. (author), Rongen, G.W.F. (author), Uijttewaal, W.S.J. (author)With the intention to reduce the negative effects of ongoing bed erosion, as well as to improve several other river functions such as protection against floods, provision of safe and efficient navigation and ecology, a ‘pilot project longitudinal training dams’ was initiated. The training dams have recently...conference paper 2017
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van Rooijen, E.J. (author), Mosselman, E. (author), Sloff, C.J. (author), Uijttewaal, W.S.J. (author)Confluences are fascinating elements in river systems. The merging of tributary rivers produces complex hydrodynamics that can play an important role in sediment transport problems, ecological studies or the routing of a pollutant. If the two merging rivers originate from different regions they can have different characteristics. One such a...abstract 2017
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Jammers, S.M.M. (author), Paarlberg, AJ (author), Mosselman, E. (author), Uijttewaal, W.S.J. (author)Longitudinal training dams (LTDs) are constructed in the River Waal in the Netherlands. They are aligned parallel to the river shore and divide the river into a main and side channel. The existing groynes are removed yielding more discharge capacity at high flows. The side channel creates possibly a ...abstract 2017
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Koopmans, H. (author), Huismans, Y (author), Uijttewaal, W.S.J. (author)Variable flows and fast morphological changes characterize the river system of Bangladesh, which includes the downstream reaches and delta of the Ganges and Brahmaputra rivers, two of the largest rivers in the world. In contrast, fresh water supply around the country largely depends on much smaller distributaries that take off from those large...abstract 2017
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Weisscher, S.A.H. (author), Baar, A.W. (author), Uijttewaal, W.S.J. (author), Kleinhans, MG (author)Lateral sorting (= bend sorting) is observed in natural meanders, where the inner and outer bend are fairly fine and coarse, respectively (e.g. Julien and Anthony, 2002; Clayton and Pitlick, 2007). This is caused by the mass differences between grains on a transverse slope, leading to coarser grains being...abstract 2017
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Duro, G. (author), Uijttewaal, W.S.J. (author), Kleinhans, M (author), Crosato, A. (author)Waterways serve for several functions besides transporting goods and people. The ecological importance of navigable rivers has taken much attention during recent decades bringing efforts to improve these natural corridors for fauna and flora (Boeters et al., 1997). Following the policy of the European Water...abstract 2017
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Baar, A.W. (author), Weisscher, S.A.H. (author), Uijttewaal, W.S.J. (author), Kleinhans, MG (author)We experimentally tested the effect of a largerange in helical flow intensity and sedimentmobility on equilibrium transverse slopes,which resulted in a function for slope effectsdepending on bed state and sedimenttransport mode, that deviates from linearfunctions with sediment mobility in literature...abstract 2017
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Le, T.B. (author), Crosato, A. (author), Uijttewaal, W.S.J. (author)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 ...abstract 2017
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Bonilla Porras, J.A. (author), Crosato, A. (author), Uijttewaal, W.S.J. (author)Although many studies regarding bank erosion and accretion can be found in the literature, it is not common to find works studying the interaction between opposite banks. Some existing morphodynamic models describe bank erosion as an event that depends on near-bank flow and bed topography, as well as on...abstract 2017
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Tas, S.A.J. (author), Gijón Mancheño, A. (author), Herman, P.M.J. (author), Reniers, A.J.H.M. (author), Uijttewaal, W.S.J. (author), Winterwerp, J.C. (author)In this paper the typical hydrodynamics on mangrove-mud coasts are studied. Worldwide, these coasts experience serious erosion problems, and while the importance of mangrove ecosystems is becoming widely recognised, mangrove restoration projects frequently fail due to poor understanding of the system, especially the hydrodynamics. Therefore, a...abstract 2017
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Gijón Mancheño, A. (author), Tas, S.A.J. (author), Herman, P.M.J. (author), Reniers, A.J.H.M. (author), Uijttewaal, W.S.J. (author), Winterwerp, J.C. (author)During recent decades, mangrove forests have experienced severe degradation due to unsustainable land use. Restoration of mangrove ecosystems requires the recovery of their habitat, considering ecology, hydrology, hydrodynamics, and sediment transport. In a first pilot in 2013, brushwood dams were built on the eroding coast of Demak, Indonesia,...abstract 2017
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Maljaars, J.M. (author), Labeur, R.J. (author), Möller, M. (author), Uijttewaal, W.S.J. (author)In this work the feasibility of a numerical wave tank using a hybrid particle-mesh method is investigated. Based on the Fluid Implicit Particle Method (FLIP) a generic formulation for the hybrid method is presented for incompressible multi-phase flows involving large density jumps and wave generating boundaries. The performance of the method...journal article 2017
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Wetser, A. (author), Uijttewaal, W.S.J. (author), Mosselman, E. (author), Penning, E. (author), Duro, G. (author), Yuan, J. (author)Over the past centuries natural river banks have been transformed into banks with artificial revetments or sheet piles to protect them from erosion. Important river features for flora and fauna have disappeared and the ecological quality of the river reduced dramatically. Recently, the importance of the ecological function of rivers has been...abstract 2017
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Orru, C. (author), Blom, A. (author), Uijttewaal, W.S.J. (author)Armor breakup and reformation was studied in a laboratory experiment using a trimodal mixture composed of a 1mm sand fraction and two gravel fractions (6 and 10mm). The initial bed was characterized by a stepwise downstream fining pattern (trimodal reach) and a downstream sand reach, and the experiment was conducted under conditions without...journal article 2016
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Vargas Luna, A. (author), Crosato, A. (author), Calvani, G. (author), Uijttewaal, W.S.J. (author)Simulating the morphological adaptation of water systems often requires including the effects of plants on water and sediment dynamics. Physical and numerical models need representing vegetation in a schematic easily-quantifiable way despite the variety of sizes, shapes and flexibility of real plants. Common approaches represent plants as rigid...journal article 2016