Rivers fieldwork Flashcards
what samplings strategy did we use
stratified: means collecting a sample made up of different parts e.g. deliberately selecting different sites so that we include a range of characteristics
how did we measure river gradient
we used ranging poles, a clinometer, & a tape measure: we measured out a 20meter stretch down stream. We put ranging poles at either end of the stretch of river. then using the clinometer to measure the gradient
how did we measure river speed
we used a flow meter, stopwatch, tape measure, and ranging poles. we took 3 readings for 60 seconds each, across the cross section using the flow meter. we calculated a average for the three readings.
how did we measure river width and depth
we used a tape measure, meter stick, and ranging poles. we measured width the tape measure. Then every 5cm we measured the depth of the river
how did we measure the angle of valley slopes
we used clinometer and ranging poles. we measured the slope by placing a ranging pole at the base of the slope and at the top of the slope then use the clinometer we found the gradient.
how did we gather information for the bipolar survey of channel and valley charictistics.
we used a grid/table. at each site we scored the characteristic between 1 and 5. For example; vegetation density of 5 means highly vegetated and 1 means no vegetation.
what dose data presented as maps show you
used to show location and patterns. mini graphs and charts can be located on maps to make it easier to compere sites
what dose data presented as photographs show you
helps to show the channel characteristic and factors around the river that might effect flood risk
what dose data presented as tables show you
can be used to present raw data that you and your group collected
what dose data presented as graphs and charts show you
there’s a wide range of graphs and charts that you can use to present your data. this can show data and patterns clearly and is easier to read than a table
