%0 Journal Article %J Science of The Total Environment %D 2022 %T Hydro-morphodynamics triggered by extreme riverine floods in a mega fluvial-tidal delta %A Wang, Jie %A Dai, Zhijun %A Fagherazzi, Sergio %A Zhang, Xiaohe %A Liu, Xiaoqiang %B Science of The Total Environment %V 809 %P 152076 %8 feb %G eng %U https://linkinghub.elsevier.com/retrieve/pii/S0048969721071527 %R 10.1016/j.scitotenv.2021.152076 %0 Journal Article %J Journal of Geophysical Research: Earth Surface %D 2022 %T Improving Channel Hydrological Connectivity in Coastal Hydrodynamic Models With Remotely Sensed Channel Networks %A Zhang, Xiaohe %A Wright, Kyle %A Passalacqua, Paola %A Simard, Marc %A Fagherazzi, Sergio %K channel geometry %K coastal numerical model %K cost function %K flow propagation %K model performance %K remote-sensed channel network %X Coastal wetlands are nourished by rivers and periodical tidal flows through complex, interconnected channels. However, in hydrodynamic models, channel dimensions with respect to model grid size and uncertainties in topography preclude the correct propagation of tidal and riverine signals. It is therefore crucial to enhance channel geomorphic connectivity and simplify sub-channel features based on remotely sensed networks for practical computational applications. Here, we utilize channel networks derived from diverse remote sensing imagery as a baseline to build a ∼10 m resolution hydrodynamic model that covers the Wax Lake Delta and adjacent wetlands (∼360 km2) in coastal Louisiana, USA. In this richly gauged system, intensive calibrations are conducted with 18 synchronous field-observations of water levels taken in 2016, and discharge data taken in 2021. We modify channel geometry, targeting realism in channel connectivity. The results show that a minimum channel depth of 2 m and a width of four grid elements (approximatively 40 m) are required to enable a realistic tidal propagation in wetland channels. The optimal depth for tidal propagation can be determined by a simplified cost function method that evaluates the competition between flow travel time and alteration of the volume of the channels. The integration of high spatial-resolution models and remote sensing imagery provides a general framework to improve models performance in salt marshes, mangroves, deltaic wetlands, and tidal flats. %B Journal of Geophysical Research: Earth Surface %V 127 %P e2021JF006294 %G eng %U https://onlinelibrary.wiley.com/doi/abs/10.1029/2021JF006294 %R 10.1029/2021JF006294 %0 Journal Article %J Advances in Water Resources %D 2022 %T Using rapid repeat SAR interferometry to improve hydrodynamic models of flood propagation in coastal wetlands %A Zhang, Xiaohe %A Jones, Cathleen E. %A Oliver-Cabrera, Talib %A Simard, Marc %A Fagherazzi, Sergio %B Advances in Water Resources %V 159 %P 104088 %8 jan %G eng %U https://linkinghub.elsevier.com/retrieve/pii/S0309170821002402 %R 10.1016/j.advwatres.2021.104088 %0 Journal Article %J Geophysical Research Letters %D 2020 %T Divergence of Sediment Fluxes Triggered by Sea‐Level Rise Will Reshape Coastal Bays %A Zhang, Xiaohe %A Leonardi, Nicoletta %A Donatelli, Carmine %A Fagherazzi, Sergio %B Geophysical Research Letters %V 47 %G eng %U https://onlinelibrary.wiley.com/doi/10.1029/2020GL087862 %R 10.1029/2020GL087862 %0 Journal Article %J Geophysical Research Letters %D 2020 %T Divergence of Sediment Fluxes Triggered by Sea-Level Rise Will Reshape Coastal Bays %A Zhang, Xiaohe %A Leonardi, Nicoletta %A Donatelli, Carmine %A Fagherazzi, Sergio %K bed composition %K numerical modeling %K salt marsh %K sea-level rise %K sediment budget %K tidal flats %X Sediment budget and sediment availability are direct metrics for evaluating the resilience of coastal bays to sea-level rise (SLR). Here we use a high-resolution numerical model of a tidally dominated marsh-lagoon system to explore feedbacks between SLR and sediment dynamics. SLR augments tidal prism and inundation depth, facilitating sediment deposition on the marsh platform. At the same time, our results indicate that SLR enhances ebb-dominated currents and increases sediment resuspension, reducing the sediment-trapping capacity of tidal flats and bays and leading to a negative sediment budget for the entire system. This bimodal distribution of sediments budget trajectories will have a profound impact on the morphology of coastal bays, increasing the difference in elevation between salt marshes and tidal flats and potentially affecting intertidal ecosystems. Our results also clearly indicate that landforms lower with respect to the tidal frame are more affected by SLR than salt marshes. %B Geophysical Research Letters %V 47 %P e2020GL087862 %G eng %U https://onlinelibrary.wiley.com/doi/abs/10.1029/2020GL087862 %R 10.1029/2020GL087862 %0 Journal Article %J Journal of Geophysical Research: Earth Surface %D 2020 %T Dynamics of Marsh‐Derived Sediments in Lagoon‐Type Estuaries %A Donatelli, Carmine %A Kalra, Tarandeep Singh %A Fagherazzi, Sergio %A Zhang, Xiaohe %A Leonardi, Nicoletta %B Journal of Geophysical Research: Earth Surface %V 125 %8 dec %G eng %U https://onlinelibrary.wiley.com/doi/10.1029/2020JF005751 %R 10.1029/2020JF005751 %0 Journal Article %J Journal of Geophysical Research: Earth Surface %D 2020 %T Dynamics of Marsh-Derived Sediments in Lagoon-Type Estuaries %A Donatelli, Carmine %A Kalra, Tarandeep Singh %A Fagherazzi, Sergio %A Zhang, Xiaohe %A Leonardi, Nicoletta %K Jamaica Bay %K marsh erosion %K sea level rise %K sediment recycling %X Salt marshes are valuable ecosystems that must trap sediments and accrete in order to counteract the deleterious effect of sea level rise. Previous studies have shown that the capacity of marshes to build up vertically depends on both autogenous and exogenous processes including ecogeomorphic feedbacks and sediment supply from in-land and coastal ocean. There have been numerous efforts to quantify the role played by the sediments coming from marsh edge erosion on the resistance of salt marshes to sea level rise. However, the majority of existing studies investigating the interplay between lateral and vertical dynamics use simplified modeling approaches, and they do not consider that marsh retreat can affect the regional-scale hydrodynamics and sediment retention in back-barrier basins. In this study, we evaluated the fate of the sediments originating from marsh lateral loss by using high-resolution numerical model simulations of Jamaica Bay, a small lagoonal estuary located in New York City. Our findings show that up to 42% of the sediment released during marsh edge erosion deposits on the shallow areas of the basin and over the vegetated marsh platforms, contributing positively to the sediment budget of the remaining salt marshes. Furthermore, we demonstrate that with the present-day sediment supply from the ocean, the system cannot keep pace with sea level rise even accounting for the sediment liberated in the bay through marsh degradation. Our study highlights the relevance of multiple sediment sources for the maintenance of the marsh complex. %B Journal of Geophysical Research: Earth Surface %V 125 %P e2020JF005751 %G eng %U https://onlinelibrary.wiley.com/doi/abs/10.1029/2020JF005751 %R 10.1029/2020JF005751 %0 Journal Article %J Earth Surface Processes and Landforms %D 2020 %T On the morphology of radial sand ridges %A Zhang, Weina %A Zhang, Xiaohe %A Huang, Huiming %A Wang, Yigang %A Fagherazzi, Sergio %B Earth Surface Processes and Landforms %V 45 %P 2613–2630 %8 sep %G eng %U https://onlinelibrary.wiley.com/doi/10.1002/esp.4917 %R 10.1002/esp.4917 %0 Journal Article %J Advances in Water Resources %D 2019 %T Fate of cohesive sediments in a marsh-dominated estuary %A Zhang, Xiaohe %A Leonardi, Nicoletta %A Donatelli, Carmine %A Fagherazzi, Sergio %B Advances in Water Resources %V 125 %P 32–40 %8 mar %G eng %U https://linkinghub.elsevier.com/retrieve/pii/S0309170818305566 %R 10.1016/j.advwatres.2019.01.003