Tropeano-1984-Earth_Surface_Processes_and_Landforms

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258 D. TROPEANO Figure 3. A runoff guage: (A) in!et hose, (B) bucket, @?-litre capacity, (C) sampling slit, (D) pivotconnected rod, (E) electro-magnetic contact Table 11. Current erosion and severe erosion values (underlined) in the experimental sites Suspended Range of peak solids Soil loss Area intensity of rainfalls Duration concentr. (g/l) (g/m) (mm/min) (min) average extr. aver. extr. Al bugnano Mongardino S. Vittoria 0.08-0.40 15-30 16 150 2 50 -- 0.40-144 - 15 - 88 2300 21800 0.07-0.40 15-60 20 150 13 200 0.40-1.24 115 2 0 0 - 243 21600 0.07440 1&30 12 55 1 25 25 - 150 @B - 15 49 - 04 mm/min; such events frequently occur in the area under survey. During 1981-1982 we recorded 34 showers (57 per cent of which equalled or exceeded 0 4 mm/min)at Albugnano, 30at Mongardino (60 per cent of which equalled or exceeded 0-4mm/min) and 23 at S. Vittoria (43 per cent of which equalled or exceeded 04 mm/min). For the showers which proved particularly effective in causing erosion, a lower limit of 0.18 mm/min may be fixed, above which threshold rainfalls are herein defined as ‘intense’. Such events are summarized in Table IV, together with the total rainfalls during which they occurred. It can be seen from this Table that practically all soil loss is due to such events of short duration.
Table 111. Storm events and related soil loss in the survey period (22 months) Albugnano (Plots A 1-2-3 combined) Mongardino (Plot M 1) S. Vittoria d'Alba (Plot C 3) Peak Soil Peak Soil Peak Soil Date Rainfall intens. loss Date Rainfall intens. loss Date Rainfall intens. loss v1 (mm) (-/min) Wm) (mm) (mm/min) (dm) (-1 (-/mi4 (dm) 8 16 May 1981 24.0 093 1492 13 July 1981 368 1.00 182 16-28 June 1981 74.0 040 70 g 26-27 May 1981 54.0 0.43 997 17 July 1981 21.0 1.20 692 7 Aug. 1981 25.8 0.83 800 22-28 June 1981 1W3 0.77 1282 9 Aug. 1981 42.6 1.17 21613(*' 11 Aug. 1981 27.6 0.45 151.0 8 2-3 July 1981 19.6 0.38 580 17 Aug. 1981 26.2 1.00 322 5 June 1982 160 0.40 0 2 18 July 1981 46.0 0.75 2 18W*) 10 Sep. 1981 33.0 066 188 26 June 1982 23.2 1.49 18.0 11 Aug. 1981 41.5 0-66 344 17 July 1982 26.6 073 332 23 July 1982 44.6 0.95 24.0 17 Aug. 1981 23.6 0.58 205 23 July 1982 27.4 040 197 6 Aug. 1982 13.0 0.46 04 g 31 Aug. 1982 24.6 1-44 519 24 July 1982 19.0 074 432 5 Sep. 1982 8.2 018 1.7 6-7 Sep. 1982 36.6 0.80 506 6-17 Aug. 1982 27.0 1.00 266 20-28 Aug. 1982 31.2 0.75 587 31 Aug. 1982 276 071 592 24-25 Sep. 1982 18.8 1.24 277 (*) Actual data unknown, because both traps and drums were filled totally by water and sediments.
Page 1 and 2: EARTH SURFACE PROCESSES AND LANDFOR
Page 3 and 4: SOIL EROSION PROCESSES 255 EXPERIME
Page 5: SOIL EROSION PROCESSES 257 Figure 2
Page 9 and 10: SOIL EROSION PROCESSES 261 Table V.
Page 11 and 12: SOIL EROSION PROCESSES 263 transpor
Page 13 and 14: SOIL EROSION PROCESSES 265 Table VI

Tropeano-1984-Earth_Surface_Processes_and_Landforms

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