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The Relationship Between Delta Form and Nitrate Retention Revealed by Numerical Modeling Experiments: Data
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| Created: | Dec 10, 2021 at 12:19 p.m. | |
| Last updated: | Dec 10, 2021 at 12:30 p.m. | |
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Abstract
River deltas display a wide range of morphologic patterns that influence how nutrients interact in channels and wetlands on their way to the coast. To quantify the role of delta morphology on nitrate fate, we simulated reactive nitrate transport over steady base flow conditions for six synthetic, morphologically unique river-dominated deltas created in Delft3D by varying incoming grain size distributions. We parameterized nitrate removal kinetics using an observed relationship with elevation from Wax Lake Delta (Louisiana, USA). Total nitrate retention across the six synthetic deltas and Wax Lake Delta ranged from 1.2-13%, suggesting that these river-dominated deltas have limited ability to remove nitrate from incoming river water. Nitrate removal is constrained by limited hydrologic connectivity with the areas of greatest nitrate demand, which are found at higher elevation. In these synthetic numerical experiments, the efficiency of nitrate removal is greatest for deltas with more topologic complexity and greater proportions of the delta plain at higher elevation, which are both common characteristics of coarser-grained deltas. The positive relationship between grain size and nitrate removal may help guide land reclamation projects if project goals include minimizing nitrate export to the sea.
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| The content of this resource is derived from | Tejedor, A., Longjas, A., Edmonds, D. A., Zaliapin, I., Georgiou, T. T., Rinaldo, A., & Foufoula-Georgiou, E. (2017). Entropy and optimality in river deltas. Proceedings of the National Academy of Sciences, 114(44), 11651-11656. |
| The content of this resource is derived from | Tejedor, A., A. Longjas, R. Caldwell, D. A. Edmonds, I. Zaliapin, and E. Foufoula-Georgiou (2016), Quantifying the signature of sediment composition on the topologic and dynamic complexity of river delta channel networks and inferences toward delta classification, Geophys. Res. Lett., 43, 3280–3287, |
| The content of this resource is derived from | Caldwell, R. L., and D. A. Edmonds (2014), The effects of sediment properties on deltaic processes and morphologies: A numerical modeling study, J. Geophys. Res. Earth Surf., 119, 961–982, doi:10.1002/2013JF002965. |
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