A map for volcaniclastic debris flow hazards in Apennine areas surrounding the Vesuvius volcano (Italy)

Figures & data

Figure 1. Location of the study area.

Table 1. A portion of the drainage basins database.

Code	Area (km^2)	Perimeter (km)	H_max (m)	H_min (m)	H_average	SL_average	Au	Al	BSF	PD
930	0.04	0.84	410.73	252.80	331.77	25.82	0.03	0.01	2.70	Very High
931	0.57	3.33	958.11	299.91	629.01	31.11	0.32	0.25	1.29	Very High
932	0.38	3.01	933.87	296.46	615.17	34.48	0.18	0.20	0.91	High
933	0.17	2.29	889.61	300.99	595.30	33.02	0.08	0.09	0.97	High
934	0.22	2.46	875.48	263.37	569.43	35.74	0.11	0.11	0.99	High
935	0.21	2.26	786.99	260.93	523.96	33.61	0.10	0.11	0.85	High
936	0.21	2.35	785.44	235.34	510.39	31.30	0.10	0.12	0.82	High
937	0.19	2.30	597.78	219.16	408.47	21.68	0.08	0.11	0.74	Moderate
938	0.19	1.95	463.26	220.92	342.09	18.31	0.14	0.05	2.63	Moderate
939	0.20	2.14	868.43	662.76	765.59	15.85	0.06	0.14	0.42	Low
940	0.32	3.17	955.54	665.11	810.32	16.64	0.21	0.11	1.93	Moderate
941	0.15	2.63	934.94	680.67	807.81	13.47	0.06	0.09	0.72	Moderate
942	0.23	2.58	929.19	665.16	797.18	16.65	0.09	0.14	0.66	Moderate
943	0.14	2.25	907.06	668.37	787.72	15.99	0.09	0.05	1.65	Moderate
944	0.13	1.61	881.55	679.96	780.75	18.16	0.06	0.07	0.88	Moderate
945	0.12	1.75	763.86	438.87	601.36	26.24	0.05	0.07	0.77	High
946	0.18	1.79	783.03	441.23	612.13	29.89	0.11	0.07	1.61	Very High
947	0.09	1.61	757.77	461.02	609.39	24.28	0.05	0.04	1.10	Moderate
948	0.07	1.25	750.04	449.01	599.52	30.82	0.03	0.04	0.73	High
949	0.06	1.17	652.78	468.42	560.60	21.79	0.04	0.02	1.64	Moderate
950	0.03	0.72	570.76	453.75	512.25	23.88	0.02	0.01	1.67	Moderate
951	0.05	1.73	977.21	650.82	814.02	23.91	0.03	0.02	1.19	Moderate
952	0.10	2.03	906.27	470.00	688.13	25.36	0.04	0.06	0.65	High
953	0.12	2.00	900.47	469.63	685.05	26.76	0.06	0.06	1.12	High
954	0.13	1.93	926.73	609.76	768.25	21.03	0.09	0.04	2.41	Moderate
955	0.15	1.79	904.46	615.40	759.93	24.23	0.08	0.07	1.12	Moderate
956	0.09	1.86	933.81	668.24	801.02	18.15	0.06	0.03	2.11	Moderate
957	0.11	1.79	927.97	670.39	799.18	19.85	0.09	0.02	3.74	Moderate
958	0.05	1.10	932.48	792.82	862.65	17.28	0.02	0.03	0.50	Low
959	0.05	0.98	930.83	794.32	862.58	20.39	0.02	0.02	1.07	Moderate
960	0.03	0.84	909.14	794.54	851.84	18.61	0.02	0.01	1.50	Moderate

Table 2. Classes of disruption proneness defined for each drainage basin (SL = slope, BSF = basin shape factor).

SL vs BSF	BSF ≥ 1.2	0.6 < BSF < 1.2	BSF ≤ 0.6
SL ≥25°	Very High	High	Moderate
SL <25°	Moderate	Moderate	Low

Figure 2. (a) Classes of topography expressed as a % of the total study area: 1 – Green areas are relatively flat, potentially vulnerable to debris flow inundation; 2 – Pink areas have slope >15° that were amenable to classification in basins; 3 – Drainage Basins; 4 – Others areas, slope <15° that were not classified into basins. (b) Distribution of drainage basins according to disruption proneness classes, as shown on the hazard map. See Table 2 for explanation of classes.

Figure 3. Examples of basin shapes in Sarno-Quindici-Siano-Bracigliano region. Basin-shape factor (BSF) is defined as ratio of upper area of basin (Au) to lower area (Al); boundary between these two areas is at location of average height [hm = (hmax + hmin)/2] of basin. The figure is modified after Pareschi et al., 2000.

Pareschi , M. T. , Favalli , M. , Giannini , F. , Sulpizio , R. , Zanchetta , G. and Santacroce , R. 2000 . May 5, 1998, debris flows in circumvesuvian areas (southern Italy): Insights for hazard assessment . Geology , 28 : 639 – 642 .

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