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UID:637eca0b-14c1-4a07-89a7-9990d906b610@nexttoyou
DTSTAMP:20261106T175625Z
DTSTART:20261112T180000Z
DTEND:20261112T200000Z
SUMMARY:Dissertation Defense-Tianyue Qu
LOCATION:Space Research Coordination Center 306\, 4107 O'Hara Street\, Pit
 tsburgh\, PA 15213
DESCRIPTION:CLIFF EVOLUTION THROUGH FEEDBACK BETWEEN DRAINAGE DIVIDE MIGRA
 TION AND WATERFALL RETREAT: MECHANISM\, RATES\, AND TIMING\n\nCliffs are 
 steep slopes that separate low-relief highland plateaus from incised lowl
 ands\, forming topographic barriers that influence the routing of water a
 nd sediment and the spatial patterns of climate and biota. Cliffs whose t
 ops align with drainage divides\, where large rivers do not cross the cli
 ff\, are expected to retreat slowly and uniformly.\n\nHowever\, such clif
 fs are often associated with deep embayments (i.e.\, alcoves) that destro
 y the cliff front even in landscapes with slow vertical erosion rates. Ho
 wever\, the processes that produce and sustain these embayments remain la
 rgely unexplored. In such cliffs\, embayments typically occur along rever
 sed channels that once flowed away from the cliff but now drain toward it
 \, forming a waterfall (i.e.\, knickpoint) where the reversed channel cro
 sses the cliff\, and a valley-confined drainage divide called a windgap. 
 In this dissertation I explore the hypotheses that (1) a feedback between
  knickpoint retreat and windgap migration toward the highland can sustain
  embayments\, and (2) that in these settings\, the rate of waterfall and 
 cliff can be used to estimate the cliff age and initial location. Topogra
 phic analyses and numerical simulations in the Negev Desert show that thi
 s feedback is feasible and can reach a dynamic equilibrium. 10Be-inferred
  migration rates in the post-orogenic Appalachian Mountains show that\n\n
 http://next-to-u.app/events/637eca0b-14c1-4a07-89a7-9990d906b610
URL:http://next-to-u.app/events/637eca0b-14c1-4a07-89a7-9990d906b610
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