Rainfall thresholds for the triggering of landslides considering previous soil moisture conditions (Asturias, NW Spain)

Valenzuela, Pablo; Domínguez-Cuesta, María José; García, Manuel Antonio Mora; Jiménez-Sánchez, Montserrat

doi:10.1007/s10346-017-0878-8

Cited by 47 publications

(47 citation statements)

References 32 publications

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“…These approaches have found a strong relation between the rainfall values triggering landslides and the initial soil moisture contributing to improve the predictive accuracy of empirical threshold. Those results have also stimulated a critical revision of the I/D thresholds in the last few years (Bogaard and Greco, 2018;Mirus et al, 2018a and2018b;Valenzuela et al, 2018). In particular, Bogaard and Greco (2018) introduced the cause-trigger concept for defining hydro-meteorological regional landslide thresholds.…”

Section: Introductionmentioning

confidence: 99%

The role of antecedent soil moisture conditions on rainfall-triggered shallow landslides

Lazzari¹,

Piccarreta

Manfreda

2018

Preprint

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Rainfall-triggered shallow landslides have caused losses of human life and millions of euros in damage to property 10 in all parts of the world. The need to prevent such phenomena combined with the difficulty to describe the geo-physical processes over large scales led to the adoption of empirical rainfall thresholds derived from the observed relationship between rainfall intensity/duration and landslide occurrence. These thresholds are generally obtained neglecting the role of the antecedent moisture conditions that should be taken into consideration. In the present manuscript, we explored the role of antecedent soil moisture on the critical rainfall intensity-duration thresholds highlighting its critical impact. Therefore, 15 traditional approaches that neglect such parameter may have a limited value in the early-warning systems. This study was carried out using a record of 326 landslides occurred in the last 18 years in the Basilicata region (southern Italy). Besides the ordinary data (i.e. rainstorm intensity and duration), we also derived the antecedent moisture conditions using a parsimonious hydrological model. 20

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Section: Introductionmentioning

confidence: 99%

The role of antecedent soil moisture conditions on rainfall-triggered shallow landslides

Lazzari¹,

Piccarreta

Manfreda

2018

Preprint

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“…It is usual that these cyclonic patterns over Asturias remain fairly stable for prolonged periods, as in the case of the events 5, 6, 8 and 12 (Table 1), producing almost continuous frontal precipitation during several weeks or months. This fact implies the reaching of high soil moisture levels and constitutes a typical landslide-triggering meteorological situation, previously described in Asturias [12]. In contrast, the anticyclonic pattern AR and the CL pattern were identified in 6 and 2 events during the wet period, causing 51 and 53 landslides respectively.…”

Section: Discussionmentioning

confidence: 74%

“…Observed outliers in Figure 5 are interpreted as a result of the scarce number of data analysed. the reaching of high soil moisture levels and constitutes a typical landslide-triggering meteorological situation, previously described in Asturias [12]. In contrast, the anticyclonic pattern AR and the CL pattern were identified in 6 and 2 events during the wet period, causing 51 and 53 landslides respectively.…”

Section: Cut-off Low Pattern (Cl)mentioning

confidence: 83%

“…The comparison between landslide and climatic data series has pointed out the abundant rainfall, and the consequent high soil moisture levels sustained during long periods, as the main trigger for the study area [36]. On this basis, regional and local rainfall thresholds for the landslide occurrence have been calculated [12,37,38].…”

Section: Study Areamentioning

confidence: 99%

“…On this basis, it is possible the computation of rainfall thresholds for the occurrence of landslides [2,8,9] and soil moisture thresholds [10][11][12] which are key elements for the implementation of early warning systems [13].…”

Section: Introductionmentioning

confidence: 99%

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Meteorological Patterns Linked to Landslide Triggering in Asturias (NW Spain): A Preliminary Analysis

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Timing of paraglacial rock‐slope failures and denudation signatures in the Cantabrian Mountains (North Iberian Peninsula)

et al. 2018

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Glacial erosion of hillslopes and stress changes induced by the transition from glacial to nonglacial conditions exert a strong influence on slope instability and are considered among the scope of paraglacial geomorphology. Failure mechanisms and coupling between paraglacial rock-slope failures (RSFs) and fluvial erosion are difficult to define. Here we show a preliminary spatio-temporal framework of paraglacial RSFs in a small catchment of the central Cantabrian Mountains, the San Isidro valley, with a dense concentration of RSFs. Preliminary radiocarbon dates obtained from two floodplain sequences deposited upstream from RSFs indicate that their sedimentation started as consequence of valley impoundment by RSFs after glacier retreat (after approximately 16.1 ka), consistent with the deglaciation pattern of nearby valleys. RSFs continued during the Holocene. Glacier erosion, debuttressing, and stressrelease conditions played an important role in slope destabilization as preparatory factors in all cases and probably triggered the oldest events. However, the long prefailure endurance (approximately 12 ka) between RSFs points to other factors such as rainfall and fluvial down-cutting of hillslopes as triggers for Holocene events.Postglacial fluvial incision rates of 2.2-2.5 mm a −1 were estimated along gullies carved into bedrock areas nonaffected by RSFs. These values are one order of magnitude higher than previous rates based on other geomorphological proxies (~0.2 mm a −1 ), suggesting accelerated fluvial incision following the last deglaciation. Local RSFs contributed to increase in fluvial incision rates by a factor of three. This study provides a quantitative perspective of postglacial land degradation relevant for understanding postorogenic landscape evolution.

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Rainfall thresholds for the triggering of landslides considering previous soil moisture conditions (Asturias, NW Spain)

Cited by 47 publications

References 32 publications

The role of antecedent soil moisture conditions on rainfall-triggered shallow landslides

The role of antecedent soil moisture conditions on rainfall-triggered shallow landslides

Meteorological Patterns Linked to Landslide Triggering in Asturias (NW Spain): A Preliminary Analysis

Timing of paraglacial rock‐slope failures and denudation signatures in the Cantabrian Mountains (North Iberian Peninsula)

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