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Bourn Brook - We do field work because we need to learn the skills to do the practical experience.

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Introduction

Bourn Brook - Introduction We do field work be cause we need to learn the skills to do the practical experience. We visited the river because we need to do the research of the river. We need to know how deep, width, velocity, erosion, bed load and sinuosity of the river. We also collect different shape of stone. Bourn Brook join to R.Cam, R.Rhee and Granta. The river system is in Cambridge. It is rural catchments. There have much wildlife like roach, pike, cow, perch and carp. The river begins north east of Henlow, where springs rise from the underlying chalk aquifer. This water-bearing chalk is the dominant geological factor in the area south and east of Cambridge, providing a natural base flow to the river. Rain percolates through the porous rock, emerging at the surface when the hard bands within prevent further downward penetration. Photographs Photo 1 (all photo by www.geocities.com/geography) There is a gentle valley, it is slumping and a collapsed river banks. ...read more.

Middle

Velocity in metres per second(10 divided by average time) Time taken in seconds 161 166 142 344 114.6 0.08 Result presentation Results analysis Site 1 Caxton Long axis Site 2 Long axis Toft 1 4.3cm 1 5cm 2 4.6cm 2 3.9cm 3 5.1cm 3 3.1cm 4 3.5cm 4 5.3cm 5 5.1cm 5 4.8cm 6 7.8cm 6 3.1cm 7 6.3cm 7 3.7cm 8 4.7cm 8 4.1cm 9 4.5cm 9 3.7cm 10 4.7cm 10 2.2cm The average pebble size at each site The average pebble size of Caxton is 5.06cm The average pebble size of Toft is 3.89cm The Average time of velocities result table Site no.1 1st run 2nd run 3rd run Total time in seconds Average time (total time divided by 3) Velocity in metres per second(10 divided by average time) Time taken in seconds 169 116 161 446 148.6 0.06 Site no.2 1st run 2nd run 3rd run Total time in seconds Average time (total time divided by 3) Velocity in metres per second(10 divided by average time) Time taken in seconds 161 166 142 344 114.6 0.08 A Fieldwork Measurements Width of channel (cm) ...read more.

Conclusion

Run: 1 2 3 Time:161 166 142 total: 344 Average time: 114.6 B Discharge Calculations The stream cross-section is plotted on graph paper (as above) Cross-section area: 160 squares X 23 square cm = 4000 square cm = 4000/10 = 0.4 square Velocity in per second = 10/114.6 = 0.087m per second Discharge = 0.087 X 0.4 = 0.034 cumecs Average discharge = 0.034 X 0.8 = 0.027 cumecs The river changed over the length, it got deeper and wider, also the river moved faster. It is because so much water will need more space to go through the river. The bed load didn't change anything. The pebbles get rounder and smaller because the current is swift.. The erosion will get more seriously. And there will have more deposition. If the water getting fast, the If the water getting fast, the momentum can make the erosion be serious. More water also will take more deposition. The valley changed from a steep v to a gently sloping one. ...read more.

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