Assume that shading in a stream prevents 80% of the light from reaching the stre
ID: 1770611 • Letter: A
Question
Assume that shading in a stream prevents 80% of the light from reaching the stream surface. How much will the stream temperature change per day under these conditions? Note that the vegetation canopy will radiate energy back to the water; assume that you can use the formula from 1f to estimate this balance, with C 0.8 (Not strictly speaking correct, but will do the job). Assume that evaporation/conduction losses are only 20 W/m2 in this scenario. How much will water temperature change per day? Given your answers to (1) and (2), do you think it possible that loss of shading could at least explain part of the increase in Columbia River water temperatures? assume any missng informatiunExplanation / Answer
Lots of information is missing as to which formula is talks about from 1f?
What is C=0.8?
But still, an attempt can be made to explain the problem above.
1. As 80% of the radiation is reflected by the shading in the stram, only 20% could reach the river.
2. Out of 20%, some amount of heat is lost in evaporation/conduction.
3. The vegetation canopy will radiate back the heat to water but of that, 80% will again be reflected back coz of shading of river.
4. So, a river having shading gradually cools down and the aquatic life suffers a great deal. Which in turn destroys the ecosystem of the river and puts river on the risk of death. So there should be a balance in shading, neither too much nor too low.
So, Columbia River temperature rise can be explained on the basis of above argument of loss of shading.