Gregory, K.J. (ed.). 1997. Fluvial Geomorphology of Great Britain. Geological Conservation Review Series, No. 13, JNCC, Peterborough, ISBN 0 412 78930 2. The original source material for these web pages has been made available by the JNCC under the Open Government Licence 3.0. Full details in the JNCC Open Data Policy

Tables

(Table 1.1) Key to the sites shown on (Figure 1.7), including classifications used in (Table 1.2)

Site Name A B C D E
1 Corrieshalloch Gorge 4
2 Falls of Clyde 4,5
3 River Findhorn at Randolph's Leap 4 1
4 Falls of Dochart 5
5 The Grey Mare's Tail 5
6 River Clyde meanders 1 2
7 Strathglass meanders 1 1 1
8 Abhainn an t-Srath Chuileannaich 1 1,2 2
9 Endrick Water 1 2
10 Derry Burn 1 1,2,4 1
11 River Balvag delta 5 1
12 The Lower River Spey 1 4 1
13 Glen Feshie 1 1,3 2,4,5
14 The Allt Dubhaig 4 4 4
15 Dorback Burn 1 2,4
16 Glen Coe: river and slope forms 4 1,3
17 Luibeg Burn 4 1
18 Allt Mor (River Nairn) 2,4 1 1,5
19 Allt Coire Gabhail 3
20 Allt Mor (River Druie) 4 1,4 5 4
21 Quoich Water alluvial fan 1 5 2
22 Allt a' Choke 4 4 5
23 Allt Coire Chailein fan 4 5 1
24 Eas na Broige debris cone 3 5
25 Oldhamstocks Burn 1,2
26 Findhorn Terraces 1
27 North Esk and West Water palaeochannels 3 1
28 Glen Roy, Glen Spean and Glen Gloy 1 5
29 Afon Llugwy between Swallow Falls and Betws y Coed 3,4,5
30 Afon Rhaeadr at Pistyll Rhaeadr 5
31 Afon Cynfal at Rhaeadr y Cwm and Rhaeadr Cynfal 3,4,5
32 Afon Twymyn at Ffrwd Fawr 3,4,5
33 Afon Glaslyn at Aberglaslyn 4 1
34 Afon Teifi at Cenarth 4 1
35 River Dee at Llangollen 2,3
36 River Wye at Lancaut 2,3
37 Afon Hepste 6
38 Afon Mellte downstream of Ystradfellte 6
39 Afon Dyfi between Dinas Mawddwy and Mallwyd 1,3
40 Afon Rheidol 1
41 Afon Vyrnwy 1 1
42 Afon Ystwyth 4 1
43 Upper Elan upstream of Craig Goch Reservoir at Bodtalog 9 1
44 Upper River Severn between Dolwen and Penstrowed 1,4 4
45 River Severn between Welshpool and the confluence of the Vyrnwy and Severn 1
46 River Dee, Holt to Worthenbury 1
47 Afon Teifi at Cors Caron 1
48 Maesnant, Pumlumon (Plynlimon) 7
49 Black Mountain scarp 3
50 Carlingill Valley, Howgill Fells 1,3 3 5 4,5
51 Langdale and Bowderdale Valleys, Howgill Fells 1 5 4,5
52 Langden Brook, Bowland Fells 4,5 4
53 River Dane, near Swettenham 1 1 6
A Langstrathdale* 4,5 3 4
B Wasdale* 4 3 4,5
C Fan Deltas at Buttermere and Crummock Water* 5
54 Black Burn 1 4 1
55 Garrigill, River South Tyne 5 1
56 River Nent, Blagill 5 1 2 1
57 The Islands (Alston Shingles), River South Tyne 1 5
58 Blackett Bridge, River West Allen 5
59 River Tyne at Low Prudoe 1 1
60 Harthope Burn 2
61 Shaw Beck Gill 1
62 Beckford 4
63 River Severn at Montford 3
64 River Axe at Axminster and Whitford 8 2
65 River Exe at Brampford Speke 5
66 River Ter at Lyons Hall 6
67 River Derwent at Hathersage 1 2
68 Highland Water 7,8
69 River Lyn 3 1
70 River Itchen near Knightcote 3
71 River Cherwell at Trafford House 3
72 Ashmoor Common 1
73 River Severn, Buildwas 1 6
74 Alport Valley 4
75 Bleaklow 3
76 Lydford Gorge 4
77 Mimmshall Brook at Water End 7
78 Aysgarth 5
79 Dovedale 1 6
80 River Culm at Rewe 4,5 6
81 River Lugg 3
82 Wilden 1 6
*Potential GCR sites.

(Table 1.2) Numbers of GCR sites representing the categories shown on (Figure 1.7)

Classification Number of sites representing the category
A. Fluvial Landforms
1 Terrace 14
2 Incised meanders 3
3 River capture/rejuvenation 9
4 Mountain torrent/slot gorge 17
5 Waterfall 9
6 Karstic site 2
7 Soil pipe/swallow hole 2
B. Fluvial processes
1 Process event-flood 19
2 Accelerated erosion 2
3 Debris flow/cones 8
4 Sediment movement 7
5 Floodplain sedimentation 5
6 Discharge control on capacity 1
7 Vegetation influence 1
8 Bank erosion 2
9 Response to confinement variation 1
C. River channel pattern and floodplain
1 Meander 14
2 Wandering 3
3 Outwash sandur 1
4 Braided 10
5 Alluvial fans 12
D. Channel change
1 Palaeochannel 18
2 Planform change 7
3 Underfit stream 3
4 Palaeofans/sediments 6
5 Paleoterraces 5
6 Palaeoconditions 5
E. Human
1 Mining 4
2 Reservoir 1
3 River management 1

(Table 3.1) Confinement materials on an 8 km reach of the Upper Elan. (After Lewin and Brindle, 1977.)

Confinement materials on an 8 km reach of the Upper Elan
Right bank Left bank Average
(km) (km) (%)
Rock 0.53 0.53 29.0
Solifluction deposits 0.75 0.74 40.1
Fluvial gravels — 0.25 6.8
Sections of complex superficial deposits 0.52 0.34 24.1
Total 1.80 1.86 100.0

(Table 3.2) Threshold discharges for bed material movement and type of reach (E = erosional; D = depositional; S = stable).

Site Discharge m3s−1
Dolwen 11.0 S
Lower Penrhuddlan 16.0 S
Craig Fryn 30.0 D
Llandinam 11.0 E
Maes-Mawr 16.2 E
Ty-Mawr 17.1 E
Penstrowed 17.1 E

(Table 3.3) Input and output of sediment from debris-flow gullies. Yearly sediment derived from sides of gully B, 30 September 1971–29 September 1972.

Western-facing side Eastern-facing side
1 2 3 4
Trap sediment yield 0.0128 0.0184 0.0039 0.0028 m3m−2yr−1
Mean sediment yield 0.0156 0.0033 m3 m−2yr−1
Gully side area 435.6 497.3 m2
Total sediment yield 6.795 1.641 m3yr−1
Total sediment derived from gully sides = 8.436 m3 in one year
Volume of debris flow removal from gullies
Gully A A B C
11.5 m3 11.5 m3 9.8 m3 8.3 m3 In observation year
9.1 m3 Outside observation year

References