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# Velocity of the water will increase steadily as down stream

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Introduction

River Velocity Hypothesis I think that the velocity of the water will increase steadily as we go down stream. This is because at site one the river shouldn't be very wide and deep, so the velocity will be slow as there will be more friction, as you go down stream the river should get wider and deeper so there will be less friction increasing therefore increasing the speed of the river. Method To measure the velocity of a river I will need to: a. Measure out a 10m stretch of river, b. At the beginning of the 10cm I will drop the cork into the river and start the stopwatch, c. When the cork reaches the end of the 10cm stretch I will stop the stopwatch and collect the cork. d. I will then repeat steps b and c a further, two times. e. I will then average out the three speeds. f. Once I have the results I will use the following equation to work out the speed of the river: Stretch of river = speed in metres per second Average time in cork I will repeat the steps a to f at each site. ...read more.

Middle

Method To find the cross-sectional area I will need to find the width and depth of the river. To do this I will: a. Width: I will measure across the top of the water between the two banks b. Depth: I will then take the depth at 10 equal intervals across the river. Once I have the information, I will average out the depth. c. Once I have the depth I will use the following equation to workout the cross-sectional area: Width (in metres) X av depth (in metres) = Cross-sectional area Results Site One Site Two Site Three Width 0.55 m 1.26m 2.20m Depth 0.08m 0.09m 0.1m Cross-sectional area 0.04m 0.12m 0.21m Conclusion My hypothesis was correct the further downstream we went the greater the cross-sectional area became. Measuring the width and depth a couple more times in the same area, then finding the average could have improved the experiment. Discharge Hypothesis I think the discharge will increase the further down stream you go, this is because there is more water in the river the further down stream you go, increasing velocity. The width also increases due to more water entering the river from streams, this increases the cross-sectional area, and therefore there is more discharge. ...read more.

Conclusion

Width: I will measure across the top of the water between the two banks b. Depth: I will then take the depth at 10 equal intervals across the river. Once I have the information, I will average out the depth. Results Site One Site Two Site Three Width 0.55m 1.26m 2.20m Average Depth 0.08m 0.09m 0.09m Conclusion My hypothesis results didn't match my hypothesis as site two and site three had the same depths this was because site 2 was on a bend so the water on the bend would have been deeper making the average depth higher. This was not a totally accurate way of collecting data as bends may affect the results also the river could have changed without you realising if your interval between measurements was large. You could improve this by taking measurements more frequently. Geography Field Trip: Rivers By: Rebecca Roberts 10x Introduction In October, we went to Snipedales, to collect information about rivers. With the information we have collected, I have been able to work out the following at three different sites: River Velocity Cross-sectional area Discharge Pebble Roundness Valley side slopes Channel Width and Depth With the information, we have found out with have been able to get a better view on the way a river changes as it goes down stream. ...read more.

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