Debris-flow monitoring in the Catalan Pyrenees. Lessons learnt ...
Debris-flow monitoring in the Catalan Pyrenees. Lessons learnt ...
Debris-flow monitoring in the Catalan Pyrenees. Lessons learnt ...
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BOZEN De ebris-<strong>flow</strong><br />
monito or<strong>in</strong>g <strong>in</strong> <strong>the</strong> Pyren nees<br />
F<strong>in</strong>al remarks: scientific aspects<br />
• Switch between no-event and event mode is crucial.<br />
• Best solution? Threshold related to ground vibration, ra<strong>in</strong>fall…<br />
• Early warn<strong>in</strong>g and alarm system<br />
• Early warn<strong>in</strong>g by ra<strong>in</strong>fall<br />
• Alarm by ground vibration (and/or <strong>flow</strong> depth; <strong>in</strong>frasound…)<br />
• Senet experience:<br />
Initiation:<br />
• Not only convective (summer) storms, but also<br />
comb<strong>in</strong>ation of (spr<strong>in</strong>g) ra<strong>in</strong>falls with snowmelt can trigger events<br />
• Summer: P crit 15 mm/h<br />
• Spr<strong>in</strong>g: P crit < ~10 mm/h<br />
• Fast <strong>in</strong>crease of soil moisture dur<strong>in</strong>g ra<strong>in</strong>fall<br />
Flow behaviour:<br />
• Mean front velocity: 5 – 9m/s
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