The River Seven is a river in North Yorkshire, England.

The River Seven rises on Danby High Moor, in the middle of the North York Moors, and flows south for about 15 miles or 25 km to meet the River Rye, at Brawby.

After leaving Danby High Moor, the river flows through Rosedale and passes Rosedale Abbey. In its lower course, it meanders due to interlocking spurs. A number of villages lie along the lower course of the River Seven. Some of these date from the 12th century or earlier, and likely none of them would exist if not for the river. For early settlers, the river may have been the only source of water and fertile land in its flood plains. They relied on the river for fishing, and washing. There are fossils in the sedimentary layers in the river, in the Jurassic layer of rock.

[edit] Geology

Simplified geology of the North York Moors

The River Seven is a small river, with not much influence on the geology of the area, although over time it has exposed various rock zones. The lacustrine deposits from the last ice age are exposed and visible in the bed of the river. There are three different time zones (periods) in the area.

• Lower Jurassic
• Middle Jurassic
• Upper Jurassic

The rock types consist of : Corallian Limestone (top layer), Oxford Clay, Raven-scar Limestone and Shales and Ironstone.

These are split up depending on their rock band and type. Over time the North York Moors are sliding downhill: you can tell this from the new bands of rock visible in the northern regions.

[edit] Geographical study

Recent surveys of the river from 12 August 2008 revealed this information about the River Seven.

• Average Velocity

The river's velocity increases, dependent on the (km) from source.^{[citation needed]} This is due to the gradient of the river being steeper causing the gravitational pull on the water to increase.

The velocity of the river Seven is directly affected by its gradient. A high gradient speeds up the flow of the river, the meanders have low gradients which slow the river down. The contact with the River Cliff and the Slip Off Slope reduces the amount of kinetic energy of the water, in turn reducing the load of sedimentation that the river can carry in suspension/solution. The river then decreases in velocity depositing sedimentation on the meander (inside) and at the same time gaining sedimentation on the outside of the meander where the river has an increase in kinetic energy on the river cliff.

This can be linked into the bed load of the River Seven, as there is a moving trend from the bed load to the channel shape of the river. A strong correlation has been observed between these factors, although anomalous results can arise from features such as tributaries, confluences and man made levees.

[edit] Settlements

• Thorgill
• Rosedale Abbey
• Cropton
• Appleton-le-Moors
• Sinnington
• Marton
• Normanby
• Great Barugh
• Brawby

[edit] References

http://www.normanby.info/riverseven.htm

[edit] External links

• Pictures of the River Seven

Coordinates: 54°11′N 0°51′W / 54.183°N 0.85°W / 54.183; -0.85