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On Thursday 9th of September 1999, year 9 left for their Geography field trip to Hennock in Devon. Hennock is a small settlement near to a place called Bovey Tracey. A large town within twenty miles is Newton Abbot.

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Introduction

Introduction On Thursday 9th of September 1999, year 9 left for their Geography field trip to Hennock in Devon. Hennock is a small settlement near to a place called Bovey Tracey. A large town within twenty miles is Newton Abbot. We drove in a coach to Hennock, down the A303 past 'Stonehenge', travelled west down towards Exeter, took the M5 south towards Newton Abbot, then took the A38 to Hennock (see figure 1). We stayed in a converted Devon Farm House. The centre is called Longlands Field Study Centre where we spent two days investigating the River Lemon (see plate 1). We returned to school on Sunday 12th September after a lot of hard work and fun. The purpose of the study was to carry out a detailed investigation of the River Lemon, its surrounding area, and the water flow for our Geography Field Project. The River Lemon was chosen because it was short enough to be studied in its entirety (35 miles long) over a weekend. The area contained considerable points of interest, and demonstrated a contrasting location compared to the outskirts of London (see figure 2). The five hypothesis we tested were: * The speed of the water is fastest on the outer bank of a meander. * The deepest part of a meander is on the outside bank. * The fastest flow of water on a straight section is in the middle of the river. * The deepest part of a straight section is in the middle. * The fastest sub-surface speed of a straight section is in the middle and just below the surface. From what I had been taught in class I would have expected the river to be faster in the lower course than the rest of the river because I thought that there would be less friction. I was expecting the sub-surface speed to be faster just beneath the surface in the middle because it has less friction. ...read more.

Middle

AVERAGE WIDTH (M) AVERAGE DEPTH (M) WETTED PERIMETER (M) AVERAGE GRADIENT C.S.A (M2) DISCHARGE (M3 or CUMECS) EFFICIENCY RATIO (Arb units) AVERAGE BEDLOAD (M) SUSPENDED LOAD DESCRIPTION BREAKDOWN OF BEDLOAD MEASUREMENTS SHAPE NUMBER R (very round) R (roundish) A (angular) a (subangular) SUMMARY TABLE OF RESULTS RIVER LEMON STOP: GROUP: VARIABLE MEASUREMENT AVERAGE SURFACE SPEED (M/SEC) AVERAGE WIDTH (M) AVERAGE DEPTH (M) WETTED PERIMETER (M) AVERAGE GRADIENT C.S.A (M2) DISCHARGE (M3 or CUMECS) EFFICIENCY RATIO (Arb units) AVERAGE BEDLOAD (M) SUSPENDED LOAD DESCRIPTION BREAKDOWN OF BEDLOAD MEASUREMENTS SHAPE NUMBER R (very round) R (roundish) A (angular) a (subangular) SUMMARY TABLE OF RESULTS RIVER LEMON STOP: GROUP: VARIABLE MEASUREMENT AVERAGE SURFACE SPEED (M/SEC) AVERAGE WIDTH (M) AVERAGE DEPTH (M) WETTED PERIMETER (M) AVERAGE GRADIENT C.S.A (M2) DISCHARGE (M3 or CUMECS) EFFICIENCY RATIO (Arb units) AVERAGE BEDLOAD (M) SUSPENDED LOAD DESCRIPTION BREAKDOWN OF BEDLOAD MEASUREMENTS SHAPE NUMBER R (very round) R (roundish) A (angular) a (subangular) SUMMARY TABLE OF RESULTS RIVER LEMON STOP: GROUP: VARIABLE MEASUREMENT AVERAGE SURFACE SPEED (M/SEC) AVERAGE WIDTH (M) AVERAGE DEPTH (M) WETTED PERIMETER (M) AVERAGE GRADIENT C.S.A (M2) DISCHARGE (M3 or CUMECS) EFFICIENCY RATIO (Arb units) AVERAGE BEDLOAD (M) SUSPENDED LOAD DESCRIPTION BREAKDOWN OF BEDLOAD MEASUREMENTS SHAPE NUMBER R (very round) R (roundish) A (angular) a (subangular) SUMMARY TABLE OF RESULTS RIVER LEMON STOP: GROUP: VARIABLE MEASUREMENT AVERAGE SURFACE SPEED (M/SEC) AVERAGE WIDTH (M) AVERAGE DEPTH (M) WETTED PERIMETER (M) AVERAGE GRADIENT C.S.A (M2) DISCHARGE (M3 or CUMECS) EFFICIENCY RATIO (Arb units) AVERAGE BEDLOAD (M) SUSPENDED LOAD DESCRIPTION BREAKDOWN OF BEDLOAD MEASUREMENTS SHAPE NUMBER R (very round) R (roundish) A (angular) a (subangular) SUMMARY TABLE OF RESULTS RIVER LEMON STOP: GROUP: VARIABLE MEASUREMENT AVERAGE SURFACE SPEED (M/SEC) AVERAGE WIDTH (M) AVERAGE DEPTH (M) WETTED PERIMETER (M) AVERAGE GRADIENT C.S.A (M2) DISCHARGE (M3 or CUMECS) EFFICIENCY RATIO (Arb units) AVERAGE BEDLOAD (M) SUSPENDED LOAD DESCRIPTION BREAKDOWN OF BEDLOAD MEASUREMENTS SHAPE NUMBER R (very round) ...read more.

Conclusion

I benefitted from the exercise because it taught me many things about rivers that I had not thought about. The habitat around the area we were working in was quite varied and gave us a contrasting location compared to the outskirts of London where I live. It was my first trip of this kind and I gained a lot of experience on how to make accurate measurements and how to conduct fieldwork. I also learnt to expect the unexpected. The exercise also allowed me to put into perspective, some elements of hydrology. For example: the size and scale of a meander. The results did not always tally with what I had been taught in the classroom, because we only studied the river in late summer and therefore the river flow might have been lower than average. If the river was more easily accessible, I would have liked to repeat the investigation several times over a number of months to give a seasonal comparison. But still, I saw many features of the river that I would not have seen anywhere else like the mini-waterfall at Pinchaford farm where I tested my hypotheses. The instruments we used in the investigation were not too difficult to use, however if the river was running quickly, the flow meter was giving problems as we had to keep it steady to record the measurements. The exercise required us to perform as a team; this meant that we had to form a group (six in all) consisting of four or five members. Each group had to nominate a leader who was responsible for organizing the group and overseeing each activity at each stop. We also had to decide on a reliable data recorder who had to be fast and accurate in order that we would have a reliable set of results. Illustrations Page 2 - Photograph of Longlands Field Study Centre Page 2 - Photograph of view from top of Haytor rocks Page 7 - Photograph of Chercombe Bridge Plate 1-Longlands Field Study Centre Plate 2-View From Top of Haytor Rocks ...read more.

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