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Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Experiments on seepage-triggered cliff landslides using cohesive wet sand

Fig. 8

Cliff height H dependence of the landslide head length \(L_{\mathrm{head}}\). a Top views after the first slide of the \(H = 4, 12.5, 20\) cm cliffs (runs 17, 9, and 13, respectively) with \(L = 13.5\) cm and \(h_{\mathrm{w}} \simeq 2\) cm. White arrows indicate the \(L_{\mathrm{head}}\). b \(L_{\mathrm{head}}\) of the first slide versus H (and H/L), of a total of 14 runs. The size of \(\bigcirc\) corresponds to the \(h_{\mathrm{w}}\) in the range of \(h_{\mathrm{w}} \simeq 2\) cm (smallest \(\bigcirc\) in black) to \(h_{\mathrm{w}} = 15\) cm (largest \(\bigcirc\) in red). A black broken line is the \(L_\mathrm{head}\) calculated from the stability analysis for \(h_{\mathrm{w}} = 2\) cm. The calculated \(L_{\mathrm{head}}\) of an \(H = 20\) cm cliff depends little on the \(h_{\mathrm{w}}\) (see text in Sect. 6.3)

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