Coastal Environments CPD – Erosional Landforms, Coastal Management and Fieldwork on the Holderness Coast According to the Bradshaw Model, the wetted perimeter of a river should increase along its course. Measuring the cross profile of ariver The discharge of a river is the volume of water flowing through a river channel. It is usually measured in cubic metres per second.

mathsf{Discharge \;(m 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. Tip: If the bed is rough and bumpy, you will need more measurements at closer intervals to get an accurate result.

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In justifying your choice of the variables you have measured it can be helpful to consider the linkages between the different river variables. Measuring river discharge According to the Bradshaw model as you move downstream river discharge should increase. This is because tributaries will feed the river leading to an increase in discharge. Measuring the velocity of a river To calculate the cross-sectional area you will need to know the mean depth. According to the Bradshaw Model depth increases from the source to the mouth of a river. Measuring river width Extend a tape measure from the point where the dry bank meets the water on one side of the river to the same point on the other side (hold it taut about 20cm above water level). Record the length, viewing the reading from directly above the tape measure.

Coastal Environments CPD – Erosional Erosion, Coastal Management, Deposition and Fieldwork on the Holderness Coast 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: In the worksheet activity students identify the same features on a simplified drawing of a river system. It is differentiated two ways: It is not possible to measure river discharge directly in the field. Instead, you need to take measurements that allow you to calculate discharge.It is not possible to measure river discharge directly in the field. Instead take measurements which will allow us to calculate discharge. The cross profile of a river changes as it moves from the upper to lower course as a result of changes in the river’s energy and the processes that the river carries out. Measuring sediment size and type For the collection of your qualitative data it is not necessary (or practical!) to measure all parts of the river – you will need to take a sample.