M2-4 Flashcards
spatial O2 variation in rivers
lower order stream= cooler and more turbulence, and more pho syn via slower and shallower water
higher order= deeper and less light, possibly faster (less macrophyte), more biodiversity of resp orgs, often more agricultural run off
temporal O2 variation in rivera
higher during the day time to phosyn rates (high at 4pm, low at 4am)
season: higher in the summer via inc phosyn, lower in winter via dec phosyn and turbulence w/ ice cover
this is realtive to the postiotn of the river though, inear equitorial regions, O2 may inc in the winter due to same phosyn but cooler temps. also depends on productivity of the river
nutirent movment types in rivers
spiralling- which includes
uptake
turnover
what factors influence nutrient spiralling and retention in rivers
O2 lvl
abundance of orgs/ demand for nutrietns
DEMAD VS SUPPLY
spiralling
the cycling of nut through assimilation (uptake), retention and mineralization (turnover) back into the water
is a low spiral length short or long? what does this mean for nutrient retention
short! this means nut have a higher retention (minimal time for the nutrient to move downstream bc they are in high demand)
what are the factors for a high nut retention
1)low flow
2) lots of attached biota
3) nigh recycle rate
4) nutrient limitation (for biol activity and growth)
point source
confined/ discrete
single source
high regulation
non point source
diffuse and often linked to hydrologic cycles
hard to control and measure
how much does P load increase between winter and summer in the bow river
load inc by 5x in the summer. this is bc in the winter, many non point sources are frozen and most of the source is water is from treatment plants.
int eh summer we have storm irrigation, stream bank erosion, irrigation runoff and more
