Which increased risk results when impermeable layers underlie alluvial fan deposits?

💡 Explanation

An impermeable layer prevents rainwater from infiltrating, triggering increased pore water pressure that decreases the effective stress. This reduces slope stability and initiating debris flows because of reduced frictional resistance and increased weight. Therefore, more debris flows occur, rather than increased recharge or altered soil chemistry.

• Which biogeochemical effect typically follows enhanced coastal upwelling along continental margins?
• Which outcome occurs when a mid-latitude cyclone intensifies, disrupting normal Hadley cell circulation?
• Which risk increases for coastal fisheries in the eastern Pacific Ocean when El Niño suppresses upwelling?
• Which effect does the Coriolis force have on warm ocean currents moving poleward from the equator?
• Which seismic effect increases liquefaction risk in unconsolidated sediment deposits during earthquakes?
• Which atmospheric effect amplifies surface temperature increase strongest with decreasing albedo?