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Investigating Rivers: Topic Detectives

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Coastal Environments CPD – Erosional Landforms, Coastal Management and Fieldwork on the Holderness Coast

Measuring the width of the river channel enables you to calculate the cross-sectional area. Also, according to the Bradshaw Model, channel width increases downstream. Measuring the wetter perimeter of a river The Bradshaw Model suggests that certain changes occur along the long profile of a typical river. For example, discharge increases as you move downstream of a river or bedload (material on the river bed) particle size decreases along the river channel. Place a metre ruler into the river until it touches the river bed. Record the distance between the river bed and the surface of the water. You should do this at regular intervals between the banks of the river. Add the depths together and divide by the number of recordings you took to calculate the mean depth. The velocity of a river is the speed the water flows. The velocity will change along the course of a river.In situations where access is more limited you may have to take a more opportunistic approach to sampling – however in this case it is sensible to get as close as possible to a systematic sample as possible.

To gather your data you need to measure a distance of 5 metres downstream. Place your float in the water upstream at 0m. Record the time it takes for the float to travel 5m. Repeat this three times and calculate the mean. Next, use the above formula to calculate the velocity.It introduces many key river concepts and a wide range of related vocabulary. First the presentation recaps the main processes of the water cycle. It then introduces some of the well known features of river systems (e.g. waterfalls and lakes). There are two activities: Tip: If the bed is rough and bumpy, you will need more measurements at closer intervals to get an accurate result. Coastal Environments CPD – Erosional Erosion, Coastal Management, Deposition and Fieldwork on the Holderness Coast Students are challenged to match eight features of river systems to photos, satellite images and maps. This activity can easily be differentiated by giving groups different numbers of cards. Questions that focus on changes along the long profile or downstream changes support in developing a hypothesis. A hypothesis is astatement, usually an educated guess, that you will either prove or disprove through the data you collect as part of your investigation. Primary Field Work Techniques

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