Rivers fieldwork Flashcards

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1
Q

what samplings strategy did we use

A

stratified: means collecting a sample made up of different parts e.g. deliberately selecting different sites so that we include a range of characteristics

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2
Q

how did we measure river gradient

A

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

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3
Q

how did we measure river speed

A

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.

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4
Q

how did we measure river width and depth

A

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

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5
Q

how did we measure the angle of valley slopes

A

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.

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6
Q

how did we gather information for the bipolar survey of channel and valley charictistics.

A

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.

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7
Q

what dose data presented as maps show you

A

used to show location and patterns. mini graphs and charts can be located on maps to make it easier to compere sites

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8
Q

what dose data presented as photographs show you

A

helps to show the channel characteristic and factors around the river that might effect flood risk

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9
Q

what dose data presented as tables show you

A

can be used to present raw data that you and your group collected

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10
Q

what dose data presented as graphs and charts show you

A

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

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