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knick zones

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Image
Map of stream channels used in <b>knick</b>-<b>zone</b> analyses in light blue. Channels ...
Published: 01 May 2017
Figure 8. Map of stream channels used in knick-zone analyses in light blue. Channels A–H correspond to the plots in Figure 9 . Individual calculations of channel steepness index are mapped as colored dots. San Andreas fault is mapped as thin red lines.
Series: GSA Special Papers
Published: 01 May 2009
DOI: 10.1130/2009.2451(08)
... migrated 30–35 km upstream on all three major branches of the river, eroding 1.2–2.6 × 10 9 Mg of sediment from the lower valleys in the process. The knick zones separate the basin into an upper watershed, receiving sediment primarily from uplands and streambanks, and a lower, incised zone, which receives...
Journal Article
Journal: GSA Bulletin
Published: 01 July 1999
GSA Bulletin (1999) 111 (7): 949-959.
... regimes, and are most commonly present downstream from a knick zone of active incision. Flume experiments and natural channel morphologic patterns lead us to infer that wall undulations are the remnants of breached, offset potholes or of sinuous longitudinal grooves formed during incision of the knick...
Journal Article
Journal: Geology
Published: 19 June 2019
Geology (2019) 47 (9): 811-814.
...) indicate lower erosion rates despite similar slope and rock types, suggesting knick-zone migration has passed that lower region of our study area. The 10 Be concentrations measured along trunk streams systematically match local, subcatchment erosion rates, with muted influence from upstream sediment...
FIGURES
Journal Article
Journal: Economic Geology
Published: 01 January 2006
Economic Geology (2006) 101 (1): 59-70.
... (thiobacilli) and sulfate-reducing bacteria have contributed to leaching and, in part, to the enrichment of copper in the supergene environment, respectively. The 5200 bench traverses a classic, but tilted, enrichment profile consisting of a 200-m-thick zone of leached capping (0.06% Cu, 0.06% S) that overlies...
FIGURES | View All (6)
Journal Article
Journal: Geology
Published: 01 February 2008
Geology (2008) 36 (2): 143-146.
... zones at the margins of the main axis of flow ( Sparks et al., 2002 ) such that h < 1000 m but h > 300 m. For a current of 90 m/s, Fr = 1.4, and 300 m < h < 1000 m, the current density is calculated in the range 1.8–3 kg/m 3 . In this density range the inferred temperature of the solid...
FIGURES | View All (4)
Journal Article
Published: 01 June 1994
Bulletin of the Seismological Society of America (1994) 84 (3): 511-527.
... in colluvial wedges. Surface flows over simple ramp steps in channel profiles caused incision that drove knick-points back by as much as 50 cm. Over more complex portions of the principal shear zone, flow was diverted into open fractures and little modification of the scarp occurred. The pre-earthquake...
Journal Article
Journal: GSA Bulletin
Published: 01 March 2007
GSA Bulletin (2007) 119 (3-4): 476-486.
..., instantaneous base-level fall at the channel mouth. Knickpoint evolution in the alluvial material downstream of the bedrock reach was dominated by inclination of the knick-point face; this resulted in a rapid transition from a waterfall at the point of base-level fall to a broad, convex zone spanning the entire...
FIGURES | View All (15)
Series: Geological Society, London, Special Publications
Published: 01 January 2011
DOI: 10.1144/SP351.5
EISBN: 9781862395992
... mafic gneisses; and (2) the development of most instabilities at convex slope breaks, which are evident as knick-points in the slope profile. Sogn and Fjordane is compared with other Norwegian regions, particularly Møre and Romsdal County, with respect to the spatial distribution of past and current...
FIGURES | View All (9)
Image
a)  Contours along the Waimakariri River. Note 1) that the coastal <b>zone</b> is ...
Published: 01 December 2003
Fig. 11. a) Contours along the Waimakariri River. Note 1) that the coastal zone is progradational; 2) the zone of null erosion or knick point, 3) valley entrenchment which increases landwards of the knick point due to tectonic uplift. Note also how the valley tapers seaward. b) Longitudinal
Image
The Uitkomst chill <b>zone</b> rocks ( A–B ) define deep crustal fractionation of ...
Published: 01 September 2006
Figure 15. The Uitkomst chill zone rocks ( A–B ) define deep crustal fractionation of an alkali basaltic precursor yielding the LI-HI-RC parental magma. The latter fractionated at shallow crustal levels to produce the observed liquid series ( B–C ). For Al 2 O 3 the two processes had different
Journal Article
Published: 01 October 2009
Bulletin of the Seismological Society of America (2009) 99 (5): 2681-2703.
...J. Fraser; J. S. Pigati; A. Hubert-Ferrari; K. Vanneste; U. Avsar; S. Altinok Abstract The North Anatolian fault ( NAF ) is a long, arcuate, dextral strike-slip fault zone in northern Turkey that extends from the Karliova triple junction to the Aegean Sea. East of Bolu, the fault zone exhibits...
FIGURES | View All (11)
Image
(A) Longitudinal profile of the Green-Colorado River system starting where ...
Published: 01 October 2013
Figure 5. (A) Longitudinal profile of the Green-Colorado River system starting where the Green River leaves the Uinta Mountains and crosses the Uinta Basin, through the Desolation knick zone, and past Crystal Geyser to the confluence of the Green and Colorado Rivers at the head of Cataract Canyon
Journal Article
Journal: GSA Bulletin
Published: 01 May 2017
GSA Bulletin (2017) 129 (5-6): 732-749.
...Figure 8. Map of stream channels used in knick-zone analyses in light blue. Channels A–H correspond to the plots in Figure 9 . Individual calculations of channel steepness index are mapped as colored dots. San Andreas fault is mapped as thin red lines. ...
FIGURES | View All (10)
Journal Article
Published: 01 February 2008
Mineralogical Magazine (2008) 72 (1): 7-10.
... about 14 ka ago. As ice sculpted the headwaters over the last few million years, rivers on the plains draining the Front Range switched from alluvial to incising, and have lowered the plains by hundreds of metres. As a result, Boulder Creek has carved a canyon with a steep knick zone presently several...
FIGURES
Series: Geological Society, London, Special Publications
Published: 01 January 2006
DOI: 10.1144/GSL.SP.2006.268.01.17
EISBN: 9781862395169
... shear zones are still active (e.g. Hodges et al. 2001 ). Evidence for this is the major difference in geomorphology and relief across both the bounding shear zones, evidence for young and recent motion along the lower MCT thrusts coincident with knick-points in the rivers, and the fact...
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Series: SEPM Special Publication
Published: 01 January 2013
EISBN: 9781565763036
... weakly developed paleosols occur in both up-dip and down-dip locations (Zones 1 and 3), indicating that incision began initially near the early falling stage shoreline, progressing up-dip by knick-point migration, and also down-dip in response to relative sea level fall. Zone 2 paleosols developed across...
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Image
Figure 8. Longitudinal channel profiles at various time intervals during th...
Published: 01 March 2007
in, and eroded from, the bedrock reach. In addition, small knick zones formed in response to delta lobe switching.
Series: GSA Field Guide
Published: 01 January 2013
DOI: 10.1130/2013.0033(01)
EISBN: 9780813756332
... al., 2012 , fig. 5 ). Figure 6. (A) Light detection and ranging-derived shaded relief map of Colorado Front Range along Boulder Creek. Approximate locations of knick zones are shown with yellow circles, and areas of transient hillslope response to canyon cutting are outlined in white...
FIGURES | View All (21)
Image
(A) Longitudinal profiles of selected channels. Black dots indicate  k   sn...
Published: 01 May 2017
Figure 9. (A) Longitudinal profiles of selected channels. Black dots indicate k sn values, and gray bars indicate interpreted location of knick zones.(B) Chi-elevation plots for selected channels. The generally steep slope in the lower-elevation portion of most plots is consistent