Slovenian national landslide database as a basis for statistical assessment of landslide phenomena in Slovenia

- A modernised national landslide database is presented and described.
- Basic statistics on landslide spatial occurrence was assessed.
- In 21 out of 211 Slovenian municipalities landslide density is larger than 1 LS/km2.
- Size and volume landslide distribution was analysed.
- Area to volume log-log relation can be defined with V = 0.9223 × A1.1996.

Landslide databases on a national scale are an important tool for good spatial planning and for planning prevention measures or remediation activities. We have developed a modern national landslide database that enabled better landslide occurrence understanding, and will in the future help to assess landslide hazard, risk, potential damage, and enable more efficient landslide mitigation. In the paper landslide database construction steps and their properties are described. Following the collection of the landslide data from various sources and their input into the database the consistency of the database was assessed. Based on the data collected we have assessed basic statistical landslide properties, such as their overall spatial distribution, size and volume and the relation between them, landslide distribution in relation to engineering-geological units and different land-use, and past landslide mitigation activities. Analysis of landslide distribution also indicated areas in Slovenia where no landslide mapping was performed in the past, yet it should be, due to the high landslide susceptibility of these areas. Consequentially future national activities in relation to landslide problems should be governed primarily based on the findings of the database analyses to achieve the highest efficiency.