Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta

Abstract It is known that representing wetland dynamics in land surface modeling improves models' capacity to reproduce fluxes and land surface boundary conditions for atmospheric modeling in general circulation models. This study presents the development of the full coupling between the Noah‐M...

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Autores principales:	Augusto Getirana, Sujay V. Kumar, Goutam Konapala, Christopher E. Ndehedehe
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	evapotranspiration Flood modeling infiltration land surface modeling two‐way coupling Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/cfc8b23bcb8341599eb1e0cf7ed4b8e8
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spelling	oai:doaj.org-article:cfc8b23bcb8341599eb1e0cf7ed4b8e82021-11-24T08:11:41ZImpacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta1942-246610.1029/2021MS002463https://doaj.org/article/cfc8b23bcb8341599eb1e0cf7ed4b8e82021-05-01T00:00:00Zhttps://doi.org/10.1029/2021MS002463https://doaj.org/toc/1942-2466Abstract It is known that representing wetland dynamics in land surface modeling improves models' capacity to reproduce fluxes and land surface boundary conditions for atmospheric modeling in general circulation models. This study presents the development of the full coupling between the Noah‐MP land surface model (LSM) and the Hydrological Modeling and Analysis Platform (HyMAP) flood model in the NASA Land Information System and its application over the Inner Niger Delta (IND), a well‐known hot‐spot of strong land surface‐atmosphere interactions in West Africa. Here, we define two experiments at 0.02° spatial resolution over 2002–2018 to quantify the impacts of the proposed developments on simulating IND dynamics. One represents the one‐way approach for simulating land surface and flooding processes (1‐WAY), that is, Noah‐MP neglects surface water availability, and the proposed two‐way coupling (2‐WAY), where Noah‐MP takes surface water availability into account in the vertical water and energy balance. Results show that accounting for two‐way interactions between Noah‐MP and HyMAP over IND improves simulations of all selected hydrological variables. Compared to 1‐WAY, evapotranspiration derived from 2‐WAY over flooding zones doubles, increased by 0.8 mm/day, resulting in an additional water loss rate of ∼18,900 km3/year, ∼40% drop of wetland extent during wet seasons, and major improvement in simulated water level variability at multiple locations. Significant soil moisture increase and surface temperature drop were also observed. Wetland outflows decreased by 35%, resulting in a substantial Nash‐Sutcliffe coefficient improvement, from −0.73 to 0.79. It is anticipated that future developments in water monitoring and water‐related disaster warning systems will considerably benefit from these findings.Augusto GetiranaSujay V. KumarGoutam KonapalaChristopher E. NdehedeheAmerican Geophysical Union (AGU)articleevapotranspirationFlood modelinginfiltrationland surface modelingtwo‐way couplingPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 5, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	evapotranspiration Flood modeling infiltration land surface modeling two‐way coupling Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	evapotranspiration Flood modeling infiltration land surface modeling two‐way coupling Physical geography GB3-5030 Oceanography GC1-1581 Augusto Getirana Sujay V. Kumar Goutam Konapala Christopher E. Ndehedehe Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta
description	Abstract It is known that representing wetland dynamics in land surface modeling improves models' capacity to reproduce fluxes and land surface boundary conditions for atmospheric modeling in general circulation models. This study presents the development of the full coupling between the Noah‐MP land surface model (LSM) and the Hydrological Modeling and Analysis Platform (HyMAP) flood model in the NASA Land Information System and its application over the Inner Niger Delta (IND), a well‐known hot‐spot of strong land surface‐atmosphere interactions in West Africa. Here, we define two experiments at 0.02° spatial resolution over 2002–2018 to quantify the impacts of the proposed developments on simulating IND dynamics. One represents the one‐way approach for simulating land surface and flooding processes (1‐WAY), that is, Noah‐MP neglects surface water availability, and the proposed two‐way coupling (2‐WAY), where Noah‐MP takes surface water availability into account in the vertical water and energy balance. Results show that accounting for two‐way interactions between Noah‐MP and HyMAP over IND improves simulations of all selected hydrological variables. Compared to 1‐WAY, evapotranspiration derived from 2‐WAY over flooding zones doubles, increased by 0.8 mm/day, resulting in an additional water loss rate of ∼18,900 km3/year, ∼40% drop of wetland extent during wet seasons, and major improvement in simulated water level variability at multiple locations. Significant soil moisture increase and surface temperature drop were also observed. Wetland outflows decreased by 35%, resulting in a substantial Nash‐Sutcliffe coefficient improvement, from −0.73 to 0.79. It is anticipated that future developments in water monitoring and water‐related disaster warning systems will considerably benefit from these findings.
format	article
author	Augusto Getirana Sujay V. Kumar Goutam Konapala Christopher E. Ndehedehe
author_facet	Augusto Getirana Sujay V. Kumar Goutam Konapala Christopher E. Ndehedehe
author_sort	Augusto Getirana
title	Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta
title_short	Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta
title_full	Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta
title_fullStr	Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta
title_full_unstemmed	Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta
title_sort	impacts of fully coupling land surface and flood models on the simulation of large wetlands' water dynamics: the case of the inner niger delta
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/cfc8b23bcb8341599eb1e0cf7ed4b8e8
work_keys_str_mv	AT augustogetirana impactsoffullycouplinglandsurfaceandfloodmodelsonthesimulationoflargewetlandswaterdynamicsthecaseoftheinnernigerdelta AT sujayvkumar impactsoffullycouplinglandsurfaceandfloodmodelsonthesimulationoflargewetlandswaterdynamicsthecaseoftheinnernigerdelta AT goutamkonapala impactsoffullycouplinglandsurfaceandfloodmodelsonthesimulationoflargewetlandswaterdynamicsthecaseoftheinnernigerdelta AT christopherendehedehe impactsoffullycouplinglandsurfaceandfloodmodelsonthesimulationoflargewetlandswaterdynamicsthecaseoftheinnernigerdelta
_version_	1718415825959911424

Impacts of Fully Coupling Land Surface and Flood Models on the Simulation of Large Wetlands' Water Dynamics: The Case of the Inner Niger Delta

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