How does wetted perimeter affect velocity

Water flowing through a wide, deep river channel encounters less resistance than water flowing in a narrow, shallow channel,…. When discharge is high vertical erosion erodes the river bed and larger sediments are transported by traction. Mid-course — here the gradient becomes less steep. The river channel gets deeper and wider as the bed and banks are eroded. The sediment load of the river gets smaller in size. Begin typing your search term above and press enter to search.

Press ESC to cancel. Skip to content Home Popular articles How does wetted perimeter affect river? Popular articles. Take recordings at different widths horizontal and depths vertical across the channel. Figure five: Using a flow meter to record the velocity of the river. Image copyright Rebecca Stokes. The geography fieldwork pages of the Barcelona Field Studies Centre provide further information on this topic. There are various charts and indexes for analysing the roundness or angularity of pebbles, including the different sediment shape and roundness indexes developed by Powers, Cailleux and Zingg.

Information about these various methods can be found on the Science Education Resource Centre website. The size and sorting of material on river beaches and slip-off slopes can also be investigated, both down-beach and down-stream. Suspended load can be investigated by using two litre plastic drinks bottles. Insert a tube into the opening of each bottle and anchor at each site facing upstream take care to stand downstream when setting up.

Leave the bottle for a set period of time and collect. Leave it to stand for a few minutes and comment on sediment characteristics, for example colour, thickness of collected layer, water clarity, settling rate.

The sediment can also be filtered and dried out to more accurately assess weights collected at different sites or under different conditions. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account.

Measuring the speed of a river requires only simple equipment such as a stop watch, a tape measure and an orange. More precise and accurate results can be obtained by using more sophisticated equipment such as a flow vane of one kind or another. The film and narration on this page shows clearly how to measure the speed of a river and further guidance is available at.

The speed of a river needs to be measured over a fixed distance of 10 m and the following sites along the river are suggested as possible locations to take the sets of measurements required:. Assessing risk and identifying control measures to manage risk. Please refer back to guidance on Pages 7 — 8 and use the template with regard to fieldwork above. If access to these locations is not possible for primary data collection then the following tables provide sets of secondary data obtained from the sites for the students to test statistically:.

Link to secondary data in Excel. Tel: Email: info exmoor-nationalpark. Check our Vacancies on our jobs page. Have you considered volunteering?