River Break Up 18 kwietnia 2009

Obudzil mnie dzisiaj jakis taki dziwny halas, jakgdyby pekajace baloniki, pomyslalam ze to pewnie deszcz, ale jak na deszcz to strasznie grube krople musialyby na nas spadac ;)

A to nie deszcz byl :D... to rzeczka nasza doszla do wniosku ze moze by tak ruszyc w sina dal ku Polnocy

Tak wygladala Athabasca dzisiaj rano. Teraz to juz bedzie wiosna.

River Break Up - How does it happen?

Most rivers flow North to South when spring progresses. Snowmelt therefore flows into areas that are already melted by warm spring weather.

The Athabasca river that flows through Fort McMurray is different. It flows South to North. When southern snowmelt enters the Athabasca it eventually flows into ice that has not yet weakened. As it flows downstream (north) some years it breaks the solid ice resulting in a dynamic break up or other years it melts the ice and a thermal break up occurs. This annual event is called River Break Up .

Thermal and Dynamic Break Ups Thermal processes melt the ice and weaken it. Things that might do this are: sunshine or wind, increased water or air temperature. Dynamic processes push the ice cover out of its original place. Things that might do this are: increased precipitation, increased water levels, water movement which causes the ice cover to break before it has weakened. Dynamic processes are usually associated with higher flood risk in the Fort McMurray area. The type of break up (thermal or dynamic) is dependent on weather and river conditions.

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