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\begin{document}

\title{About the collapse of a huge ice sheet lake on the Laurentide ice sheet.}



\author[1]{SHOUJI Yoshinori}%
\affil[1]{JpGU}%


\vspace{-1em}



  
  \date{May 26, 2024}


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\begin{abstract}
A theory postulates that a huge ice lake named ``Lake Agassiz'' existed
near the border between Canada and the United States during the last
glacial age. It was thought that this lake collapsed, sometime between
13,000 to 8,200 years ago, causing global environmental changes such as
cooling in the Younger Dryas period and the sea level rise. However, the
truth about Lake Agassiz and its collapse remained unclear. To verify
the actuality of the collapse, a simulation software was created for the
geomorphological analysis and water volume calculation. The result of
the present analysis indicated that the amount of water in Lake Agassiz
was much smaller than presumed in the previous theory. Considering the
surrounding topography, we deduced that Lake Agassiz was not the type of
lake whose collapse would have caused a large-scale flood. Additionally,
from a slope map created for the North American continent, we discovered
a topography that appears to be a trace of erosion caused by a
large-scale flood near Lake Agassiz. These findings reveal that the
flooding of Lake Agassiz was likely caused by the collapse of an even
larger ice-sheet lake. This study considers the scale and mechanism of
the floods from a giant ice-sheet lake that existed in the Laurentide
Ice Sheet.%
\end{abstract}%



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