JM
Jan-Hendrik May
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3 records found
1
Wind-driven hydrodynamic and depositional patterns in shallow lakes
An exploratory modelling approach based on an archetypal case of Lake Hulun
Journal article
(2025)
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Xinyu Xue, Joep Storms, Florin Zăinescu, Mathieu Schuster, Li Wang, Jan Hendrik May, Zhi Lin Ng, Helena van der Vegt, Zaixing Jiang, More authors...
Lake Hulun, the fifth-largest lake in China, is a shallow lake (water depth <10 m) with typical wave-dominated landforms developed around the shoreline, with a semi-enclosed bay located in its southern corner. This novel study aims to understand wind-driven hydrodynamics and its related depositional patterns in the data-sparse Lake Hulun. To achieve this, a series of numerical simulations were conducted with a hydrodynamic and sediment transport model. The simulated hydrodynamic patterns are greatly influenced by wind direction shifts but are subject to little impact from wind speed changes which act mainly to accelerate flow. By varying the location and depth of the deepest part of the lake, this study reveals that the location of the depth centre has little impact on the overall hydrodynamic pattern of wind-driven waterbodies. When the wind direction is perpendicular to the long-axis shore, currents around the short-axis shore flow in a direction that follows the wind direction. This study considers the wind-induced longshore currents that are oblique to the long-axis shore as the main driving force in transporting sediments along the shore and erosion of the shoreline. The formation of semi-closed bays in both Lake Hulun, together with its nearby sister lake – Lake Buir – are attributed to the north-west prevailing wind direction. Further exploratory simulations confirmed that prevailing winds tend to induce parallel distributed submerged sediment accumulations in the nearshore zone, challenging the notion of sediment accumulation solely in deep water zones. This study provides valuable insights into the hydro-sedimentary dynamics in wind-driven waterbodies, offering a process-based perspective and contributing to current understanding of the palaeogeography of ancient lake systems.
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Lake Hulun, the fifth-largest lake in China, is a shallow lake (water depth <10 m) with typical wave-dominated landforms developed around the shoreline, with a semi-enclosed bay located in its southern corner. This novel study aims to understand wind-driven hydrodynamics and its related depositional patterns in the data-sparse Lake Hulun. To achieve this, a series of numerical simulations were conducted with a hydrodynamic and sediment transport model. The simulated hydrodynamic patterns are greatly influenced by wind direction shifts but are subject to little impact from wind speed changes which act mainly to accelerate flow. By varying the location and depth of the deepest part of the lake, this study reveals that the location of the depth centre has little impact on the overall hydrodynamic pattern of wind-driven waterbodies. When the wind direction is perpendicular to the long-axis shore, currents around the short-axis shore flow in a direction that follows the wind direction. This study considers the wind-induced longshore currents that are oblique to the long-axis shore as the main driving force in transporting sediments along the shore and erosion of the shoreline. The formation of semi-closed bays in both Lake Hulun, together with its nearby sister lake – Lake Buir – are attributed to the north-west prevailing wind direction. Further exploratory simulations confirmed that prevailing winds tend to induce parallel distributed submerged sediment accumulations in the nearshore zone, challenging the notion of sediment accumulation solely in deep water zones. This study provides valuable insights into the hydro-sedimentary dynamics in wind-driven waterbodies, offering a process-based perspective and contributing to current understanding of the palaeogeography of ancient lake systems.
Littoral landforms of Lake Hulun and Lake Buir (China and Mongolia)
Wind-driven hydro-sedimentary dynamics and resulting clastics distribution
Journal article
(2024)
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Li Wang, Mathieu Schuster, Zai Xing Jiang, Shi Wei Xin, Florin Zainescu, Xin Yu Xue, Joep Storms, Jan Hendrik May, Alexis Nutz, Helena van der Vegt, Guilherme Bozetti
Two rectangular-shaped lakes, Lake Hulun and Lake Buir, located at the boundary between China and Mongolia, only c. 75 km apart and therefore experiencing similar wind fields, have been studied based on satellite images and field surveys in order to compare their geomorphological and sedimentological characteristics. The wind-driven hydrodynamics, which have a significant effect on the development of littoral landforms and on sediment distribution, have been discussed for the two similar lakes that experienced a prevailing wind perpendicular to their long axis. A conceptual model related to wind-driven water bodies and sediment distribution is proposed. Wave-influenced to wave-dominated deltas, beaches, spits, and eolian dune deposits develop around these two lakes, with a strikingly similar distribution pattern. These features locally inform the longshore drift and help reconstruct the water circulation induced by wind forcing. Under the NW prevailing wind regime, the spits developed on the SW coast with a NW–SE extension, which was influenced by the NW–SE longshore currents. The same influence was observed in the delta extension in the NE area. The differences lie in the presence of fan deltas in the NW region of Lake Hulun, but not in Lake Buir. Additionally, the width of the beach and eolian deposits on the downwind coast of Lake Hulun is three times greater than that of Lake Buir which were caused by the differences in sediment supply and wind fetch between the two lakes. Lake Hulun and Lake Buir provide two reliable examples to understand the relationship among the wind field, provenance, hydrodynamics, landforms, and asymmetrical distribution of clastics in elongated lakes. They also represent relevant modern analogs, which may also be of guiding significance to wind-driven sand body prediction in lacustrine basins.
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Two rectangular-shaped lakes, Lake Hulun and Lake Buir, located at the boundary between China and Mongolia, only c. 75 km apart and therefore experiencing similar wind fields, have been studied based on satellite images and field surveys in order to compare their geomorphological and sedimentological characteristics. The wind-driven hydrodynamics, which have a significant effect on the development of littoral landforms and on sediment distribution, have been discussed for the two similar lakes that experienced a prevailing wind perpendicular to their long axis. A conceptual model related to wind-driven water bodies and sediment distribution is proposed. Wave-influenced to wave-dominated deltas, beaches, spits, and eolian dune deposits develop around these two lakes, with a strikingly similar distribution pattern. These features locally inform the longshore drift and help reconstruct the water circulation induced by wind forcing. Under the NW prevailing wind regime, the spits developed on the SW coast with a NW–SE extension, which was influenced by the NW–SE longshore currents. The same influence was observed in the delta extension in the NE area. The differences lie in the presence of fan deltas in the NW region of Lake Hulun, but not in Lake Buir. Additionally, the width of the beach and eolian deposits on the downwind coast of Lake Hulun is three times greater than that of Lake Buir which were caused by the differences in sediment supply and wind fetch between the two lakes. Lake Hulun and Lake Buir provide two reliable examples to understand the relationship among the wind field, provenance, hydrodynamics, landforms, and asymmetrical distribution of clastics in elongated lakes. They also represent relevant modern analogs, which may also be of guiding significance to wind-driven sand body prediction in lacustrine basins.
Journal article
(2023)
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Florin Zăinescu, Helena van der Vegt, Joep Storms, Alexis Nutz, Guilherme Bozetti, Jan-Hendrik May, Sagy Cohen, Frederic Bouchette, Simon Matthias May, Mathieu Schuster
A complete annual cycle of the dynamics of fine-grained sediment supplied by the Omo and smaller rivers is simulated for Lake Turkana, one of the world’s large lakes, with the hydrodynamic, wave and sediment transport model Delft3D. The model is forced with river liquid and solid discharge and wind data in order to simulate cohesive sediment transport and resuspension. It simulates stratification due to salinity, wave generation and dissipation, and sediment advection and resuspension by waves and currents, with multiple cohesive sediment fractions. A comparison of the simulation results with remotely-sensed imagery and with available in-situ sediment deposition rates validates the model. By devising simulation scenarios in which certain processes were switched on or off, we investigated the contribution of waves, wind-induced surface and bottom currents, salinity-induced stratification and river jet, in resuspending and transporting fine sediments in the lake basin. With only the wind or river influence, most of the sediment deposition occurs in the first 10 km off the Omo River mouth and at a depth 30 m. This study sheds new light on sediment transport in Lake Turkana and in great lakes in general, favouring the view that wind-waves can be the main agent that transports sediment away from river mouths and to deeper areas, as opposed to river-plume or gravity-driven transport.
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A complete annual cycle of the dynamics of fine-grained sediment supplied by the Omo and smaller rivers is simulated for Lake Turkana, one of the world’s large lakes, with the hydrodynamic, wave and sediment transport model Delft3D. The model is forced with river liquid and solid discharge and wind data in order to simulate cohesive sediment transport and resuspension. It simulates stratification due to salinity, wave generation and dissipation, and sediment advection and resuspension by waves and currents, with multiple cohesive sediment fractions. A comparison of the simulation results with remotely-sensed imagery and with available in-situ sediment deposition rates validates the model. By devising simulation scenarios in which certain processes were switched on or off, we investigated the contribution of waves, wind-induced surface and bottom currents, salinity-induced stratification and river jet, in resuspending and transporting fine sediments in the lake basin. With only the wind or river influence, most of the sediment deposition occurs in the first 10 km off the Omo River mouth and at a depth 30 m. This study sheds new light on sediment transport in Lake Turkana and in great lakes in general, favouring the view that wind-waves can be the main agent that transports sediment away from river mouths and to deeper areas, as opposed to river-plume or gravity-driven transport.