PSI - Issue 62

Nicola Perilli et al. / Procedia Structural Integrity 62 (2024) 546–552 Nicola Perilli, Massimiliano Lombardi, Nicola Nenci, Nunziante Squeglia, Stefano Stacul / Structural Integrity Procedia 00 (2019) 000 – 000 5

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accurate estimation of the morphometric data required for characterizing the Source Area of the Potential Landslide, will also permit a better evaluation of the extent of the interference and consequently a more accurate assessment of the landslide vulnerability. The introduction of the subclasses and subcategories for the description of the source area (and its material) that will feed the Potential Landslide (Sub-Sections D and E of Tab. 2), is one of the key differences with the current Field Sheet Form of the LLG, and it will permit to better evaluate both primary and secondary parameters. Considering that the assessment of both type and extent of the interference is a challenge also for Recognized Landslide, the Authors recommend always filling, during the Periodic Field Survey, the here presented Additional Field Sheet Form for a more reliable selection of one of the three available options: Total, Partial, Approach Zone .

Table 2. Second section of the Additional Field Sheet Form (this work)

LANDSLIDE CHARACTERIZATION

Characterization of the source area of the Potential Landslide (PLS) – SUB-SECTION D PLS Source Area location Slope gradient different with respect to context Position Orography High More steep 25-35° >35°

Middle Bottom Slope base

Right Left

Similar

10-15°

15-25°

Less steep

0-5°

5-10°

Slope profile of the PLS Source Area *

Stream

Features Source Area

Position

Concave Linear Convex

Terraced Undulated Irregular

Linear erosion Lateral erosion

Within the source area Base slope

*Specify if different with respect to the geomorphological context Characterization of the Source Area material – SUB-SECTION E

Bedding-slope relationship of Source Area

Strati metric or textural features* of Displaced Material

Disarticulated Disrupted stratification

Dip slope Anti-dip slope

Cross-dip slope Horizontal

Not relevant Not measurable

Massive Chaotic

Bedrocks* of Source Area

Soil* of Source Area

Depth (m)

Weathered part (m)

Thickness (m)

Weathered part (m)

*Specify if different with respect to the geomorphological and geological context

Crop of Source Area Fruit Horticulture cops Herbaceous

Vegetation cover of Source Area

Construction of Source Area

Others of Source Area

Woods Shrubs Grass Barren Soil/rocks

Road Bridge Building

Drainage channels Road curbs

Diagnostic elements for identifying the PLS – SUB-SECTION F

Land cover

Inclined walls Retaining wall Terraces walls Construction Discontinuity

Inclined pillars Electric lines Telephone lines Fences

Others

Diffuse inclined trees Several inclined trees Scattered rare inclined trees Isolated inclined trees

Drainage channels Road curbs

Morphology

Abandoned constructions

Others

Building Garage Well Animal drinkers Dirt road

Shelfs Counter-dependencies Undulations Arcuate lobes

Fractures Fissures

Spring waters Waterlogging

Expected features of the PLS – SUB-SECTION G

Types of expected LS

Source

Distribution of the activity

Movement Fall/Topple Slide Flow Spread DSGSD Complex

Material Material

Area

Rock mass

Soil

Diagnostic Area Geomorphological significative area

Eluvial Colluvial Alluvial Bedrock

Rock Debris Earth

Disarticulated Disrupted Chaotic

Matrix-supported Grain-supported Chaotic

Relevant Area Approach Zone Influence Zone