Simulating the effects of fish canals on the Logone Floodplain


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Created: Nov 06, 2021 at 12:34 a.m.
Last updated: Nov 13, 2021 at 1:21 p.m.
DOI: 10.4211/hs.6f96b71a982743c2905e00de35bdb817
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Abstract

Assessing the impact of climate change on floodplain productivity poses unique challenges for hydrodynamic models. For example, the dynamics of floodplain fisheries are governed both by inundation dynamics across thousands of km2, and water storage timing within small depressions (which serve as fish habitat) connected to the river network by meter-scale manmade canals, controlled by flow across fishing weirs. Here, we propose to represent these features as a system of effective, interconnected sub-grid elements within a coarse-scale model. We test this strategy over the Logone floodplain in Cameroon, and its floodplain fishery. We first validate this strategy for a local study area (30 km2); we find that hydraulic models at resolutions from 30 m to 500 m are able to reproduce hydraulic dynamics as documented by in situ water level observations. When applied to the entire floodplain (16,000 km2), we find that the proposed modeling strategy allows accurate prediction of observed pattern of recession in the depressions. Artificially removing floodplain canals in the model causes residence time of water in depressions to be overpredicted by approximately 30 days. This study supports the strategy of modeling fine-scale interconnected features as a system of sub-grid elements in a coarse resolution model for applications such as assessing the sensitivity of floodplain fisheries to future climate change.

Shastry, Apoorva Michael Durand; Jeffrey Neal; Alfonso Fernández; Sui Chian Phang; Brandon Mohr; Hahn Chul Jung; Saïdou Kari; Mark Moritz; Bryan Mark; Sarah Laborde; Asmita Murumkar; Ian Hamilton. 2020. Small-scale anthropogenic changes impact floodplain hydraulics: simulating the effects of fish canals on the Logone Floodplain. Journal of Hydrology, 588: 125035. 125035.10.1016/j.jhydrol.2020.125035.

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Logone Floodplain, Cameroon
Longitude
14.9681°
Latitude
11.0893°

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End Date:

Content

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The following web services are available for data contained in this resource. Geospatial Feature and Raster data are made available via Open Geospatial Consortium Web Services. The provided links can be copied and pasted into GIS software to access these data. Multidimensional NetCDF data are made available via a THREDDS Data Server using remote data access protocols such as OPeNDAP. Other data services may be made available in the future to support additional data types.

References

This resource belongs to the following collections:
Title Owners Sharing Status My Permission
Modeling Regime Shifts in the Logone floodplain (MORSL) Mark Moritz  Public & Not Shareable Open Access

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
National Science Foundation CNH: Exploring Social, Ecological, and Hydrological Regime Shifts in the Logone Floodplain of Cameroon BCS-1211986

How to Cite

Moritz, M. (2021). Simulating the effects of fish canals on the Logone Floodplain, HydroShare, https://doi.org/10.4211/hs.6f96b71a982743c2905e00de35bdb817

This resource is shared under the Creative Commons Attribution-NoCommercial CC BY-NC.

 http://creativecommons.org/licenses/by-nc/4.0/
CC-BY-NC

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