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\begin{document}

\title{Untangling the Effects of Seasonality and Post-Fire Stream Channel
Erosion on the Hydrologic Response of a Burned Mountain Catchment}



\author[1]{Michael Gieschen}%
\author[1]{Peter Nelson}%
\affil[1]{Colorado State University}%


\vspace{-1em}



  
  \date{May 22, 2024}


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\selectlanguage{english}
\begin{abstract}
Stream channel incision and deposition are common after wildfire, and
these geomorphic changes may impact runoff mechanisms and the
composition of pre-event and event water in runoff. To investigate this,
we monitored discharge and electrical conductivity at 6 nested sites
within a 15.5 km \textsuperscript{2} watershed in the northern Colorado
Front Range that had recently burned, experienced large flooding, and
well-documented and significant channel erosion and deposition. Over the
study period, the watershed experienced seven precipitation events. For
each hydrograph, we separate baseflow from runoff using a new method to
characterize and account for the strong diurnal signal in the baseflow.
Electrical conductivity is used as a tracer in a two-component
end-member mixing analysis to separate the event hydrographs into event
and pre-event water. Correlation coefficients were computed between key
variables of the hydrologic response (such as runoff ratio, volumes of
event and pre-event water) to storm and basin characteristics (including
stream channel erosion/deposition, fraction of high/moderate burn
severity, precipitation intensity, and antecedent precipitation). The
strength and significance of correlations was found to vary seasonally.
In the early season, event and pre-event volumes did not vary
significantly with basin or storm characteristics. In the late season,
antecedent precipitation correlated with a decrease in event runoff (R
\textsuperscript{2} = 0.34) and total runoff (R \textsuperscript{2} =
0.40), increased precipitation intensity correlated with an increase in
event runoff (R \textsuperscript{2} = 0.48), and local erosion
correlated with an increase in pre-event runoff (R \textsuperscript{2} =
0.60) and total runoff (R \textsuperscript{2} = 0.53). These findings
indicate that seasonality and post-fire stream channel erosion influence
the makeup of runoff response, most likely through their impact on the
gradient of the near-stream groundwater table.%
\end{abstract}%



\sloppy


\textbf{Hosted file}

\verb`Untangling Effects of Wildfire on Hydrologic Response- HP Journal Version_Final.docx`  available at \url{https://authorea.com/users/496806/articles/578058-untangling-the-effects-of-seasonality-and-post-fire-stream-channel-erosion-on-the-hydrologic-response-of-a-burned-mountain-catchment}\selectlanguage{english}
\begin{figure}[H]
\begin{center}
\includegraphics[width=0.70\columnwidth]{figures/Figure-3---Example-Hydrograph-Line-Fit/Figure-3---Example-Hydrograph-Line-Fit}

\end{center}
\end{figure}\selectlanguage{english}
\begin{figure}[H]
\begin{center}
\includegraphics[width=0.70\columnwidth]{figures/Figure-4---Example-Hydrograph-Seperation/Figure-4---Example-Hydrograph-Seperation}

\end{center}
\end{figure}\selectlanguage{english}
\begin{figure}[H]
\begin{center}
\includegraphics[width=0.70\columnwidth]{figures/Figure-5---Anteceedent-Moisture-Concept/Figure-5---Anteceedent-Moisture-Concept}

\end{center}
\end{figure}\selectlanguage{english}
\begin{figure}[H]
\begin{center}
\includegraphics[width=0.70\columnwidth]{figures/Figure-2---Season-Record-and-Diurnal-Flux-5/Figure-2---Season-Record-and-Diurnal-Flux-5}

\end{center}
\end{figure}\selectlanguage{english}
\begin{figure}[H]
\begin{center}
\includegraphics[width=0.70\columnwidth]{figures/Figure-6---Localized-Erosion-Concept/Figure-6---Localized-Erosion-Concept}

\end{center}
\end{figure}\selectlanguage{english}
\begin{figure}[H]
\begin{center}
\includegraphics[width=0.70\columnwidth]{figures/Figure-1---Skin-Gulch-Map-600-dpi/Figure-1---Skin-Gulch-Map-600-dpi}

\end{center}
\end{figure}

\textbf{Hosted file}

\verb`Table 1 - Description of Variables.xlsx`  available at \url{https://authorea.com/users/496806/articles/578058-untangling-the-effects-of-seasonality-and-post-fire-stream-channel-erosion-on-the-hydrologic-response-of-a-burned-mountain-catchment}

\textbf{Hosted file}

\verb`Table 2 - Results Summary.xlsx`  available at \url{https://authorea.com/users/496806/articles/578058-untangling-the-effects-of-seasonality-and-post-fire-stream-channel-erosion-on-the-hydrologic-response-of-a-burned-mountain-catchment}

\textbf{Hosted file}

\verb`Table 3 - Results Correlations.xlsx`  available at \url{https://authorea.com/users/496806/articles/578058-untangling-the-effects-of-seasonality-and-post-fire-stream-channel-erosion-on-the-hydrologic-response-of-a-burned-mountain-catchment}

\selectlanguage{english}
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\end{document}

