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\begin{document}

\title{Intended vs unintended consequences of modifying coastal river channels}



\author[1]{John Malito}%
\author[1]{David Mohrig}%
\affil[1]{University of Texas at Austin}%


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  \date{May 08, 2024}


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\begin{abstract}
Capital works projects, particularly the modification of coastal rivers,
are becoming increasingly significant to economic activities worldwide
as a response to climate-driven changes and urbanization. The benefits
of channel modification projects can be realized quickly, but the
altered movement of sediments in the river channel can lead to
unintended morphologic changes decades later. An example of this is the
closure of the San Bernard River mouth, located on the central coast of
Texas, which was clogged by sediments in the 1990s as a result of two
major projects in the area: the diversion of the Brazos River channel
(1929) and the construction of the Gulf Intracoastal Waterway (GIWW)
(1940s). The objective of this study was to document the delayed
geomorphic response to the projects using historical aerial imagery and
provide a snapshot of flow pathways in the area using measurements
collected in situ. Results showed that the GIWW was the main conduit for
river flow as it bisects the San Bernard 2 km inland of its river mouth,
reducing discharge in the terminal limb of the river. Due to reduced
flow, the river mouth became clogged with wave-transported sediment
supplied the Brazos River which had been diverted to within 6 km of the
San Bernard. With no connection to the sea, altered sediment and flow
pathways have led to numerous hazards and costly corrective dredging
projects. To optimize the cost-effectiveness of channel modification
projects their long-term impact must be considered as managers continue
to adapt to ever-changing coastal zones.%
\end{abstract}%



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