PSI - Issue 62

Nicola Perilli et al. / Procedia Structural Integrity 62 (2024) 546–552 549 4 Nicola Perilli, Massimiliano Lombardi, Nicola Nenci, Nunziante Squeglia, Stefano Stacul / Structural Integrity Procedia 00 (2019) 000 – 000

parameters of the slope and stream, and the geotechnical characteristics of rocks and soils; (b) characterization of the vegetation cover and the land use, as the evolution or alteration of Land Use / Land Cover caused by anthropogenic activities can frequently contribute to pave or trigger landslide, or they are useful to identify the source areas of Potential Landslide (Tab. 1). The second section is aimed to characterize the source areas of the Potential Landslide and to check diagnostic elements for its identification (Sub-Section F of Tab. 2) and for the prediction of the type of movement (Sub-Section G of Tab. 2). In particular, the diagnostic elements are intended to provide a checklist for distinguishing between Recognized or Potential Landslides, namely the absence of some of the elements is useful to recognize the presence of a Potential Landslide, on the contrary their presence permit to recognize the presence of a Recognized Landslide.

Table 1. First section of the Additional Field Sheet Form (this work)

CONTEXT CHARACTERIZATION

Geomorphological Context – SUB-SECTION A

Slope gradient of Geomorphological Significative Area

Physiographic units

Slope gradient

Mountain Large valley Narrow valley

Hill

Terrace

25-35° 10-15°

>35°

Steeper Similar

Alluvial Plain Coastal Plain

Alluvial fan

15-25°

Colluvial apron

0-5°

5-10°

Less steep

Slope

Stream

Profile

Aspect

Features

Position

N E S W

NE SE SW NW

Axial Not Axial Slope base Close base slope

Terraced Ondulated Irregular

Linear Concave Convex

Confined Semiconfined Not confined

Geological Context – SUB-SECTION B

Formation/Unit:

Member:

Lithofacies:

Main Lithology:

Other Lithology: intercalation/alternance:

Lithotechnical units

Coherent material

Granular or Cohesive materials

Rocks mass

Debris

Debris

Mud

Complex mainly dominated by rocks Complex mainly dominated by Pelites

Coarse grained

Coarse grained

Clast %

Fine grained

Fine grained

Matrix %

Rocks mass characteristic

Strati metric or textural characteristics

Stratified Massive Disarticulated Disrupted

Grain-supported texture Matrix-supported texture

Micro-discontinuity, block volume: centimetric/decimetric Meso-discontinuity, block volume: decimetric/metric Macro-discontinuity, block volume: metric/multi-metric

Massive Chaotic

Bedrocks

Soil

Depth (m)

Weathered part (m)

Thickness (m)

Weathered part (m)

Hydrogeologic properties – SUB-SECTION C

Very Porous

Very permeable

Porous

Permeable

Moderately Porous Slightly Porous

Moderately permeable Slightly permeable

Not Porous

Impermeable

Lande Cover/Land Use (C)

Others

Woods Shrubs Grass Barren Soil/rocks

Retaining wall Terraces walls Construction Dirt road

Rural Urban Industrial Agricultural

Cultivated (c) c Arboreal c Herbaceous Horticulture

Electric lines Telephone lines Fences

The third section (Tab. 3) is aimed to collect all the data useful for an accurate estimation of the primary parameters (velocity and magnitude) of the Potential Landslide that will be also evaluated based on the value of similar phenomena recognized in the Geomorphological Significative Area or in the Diagnostic Area. Furthermore, an