Drainage rearrangement, involving stream piracy (capture), drainage diversion and/or beheading, may be significant for sediment budgets (including provenance) and biotic distributions, as well its more usually considered role in landscape evolution. The processes involved rearrangement are not self-evident abundant literature indicates. This is especially the case with commonly invoked capture. key process capture, namely, head retreat, difficult to envisage a normal part of net evolution,...

Abstract Research in landscape evolution over millions to tens of years slowed considerably the mid‐20th century, when Davisian and other approaches geomorphology were replaced by functional, morphometric ultimately process‐based approaches. Hack's scheme dynamic equilibrium was perhaps major theoretical contribution long‐term between 1950s about 1990, but it essentially ‘looked back’ Davis for its springboard a viewpoint contrary that Davis, as did less widely known schemes, such Crickmay's...

Abstract Knickpoint behaviour is a key to understanding both the landscape responses base‐level fall and corresponding sediment fluxes from rejuvenated catchments, must be accommodated in numerical models of large‐scale evolution. recession streams draining glacio‐isostatically uplifted shorelines eastern Scotland used assess whether knickpoint function discharge (here represented by its surrogate, catchment area). Knickpoints are identified using DS plots (log slope versus log downstream...

Abstract The equilibrium form of the fluvial long profile has been used to elucidate a wide range aspects landscape history including tectonic activity in collision zones, and continental margin other intraplate settings, as well base‐level changes such due sealevel fluctuations. Hack SL profile, which describes straight line on log–normal plot elevation (normal) versus distance (logarithmic), is that most widely studies; slope–area analysis also recent years. We show special case more...

We have used early Miocene valley‐filling basalts to reconstruct fluvial long profiles in the Upper Lachlan catchment, SE Australia, order use these as well‐constrained initial conditions a forward model of incision. Many different incision algorithms been proposed, and it is not clear at present which one best captures behavior bedrock rivers. test five formulations; ability models reproduce observed present‐day stream amounts assessed using weighted‐mean misfit criterion well structure...

Social play between pairs of individually housed juvenile rats was studied by measuring pinning frequencies occurring during rough-and-tumble play. Low doses morphine increased play, and opioid blockade with naloxone reduced Dominance, as measured which pinned most, markedly slightly morphine. These effects were most apparent when animals treated these drugs continuously from the beginning testing. Although respective tended to reverse established dominance patterns (i.e., made dominant more...

ABSTRACT The Konkan and Kerala Basins constitute a major depocentre for sediment from the onshore hinterland of Western India as such provide valuable record timing magnitude Cenozoic denudation along continental margin. This paper presents an analysis sedimentation in Konkan–Kerala Basin, coupled with mass balance study, numerical modelling flexural responses to denudational unloading offshore loading order test competing conceptual models development high‐elevation passive margins. Basin...

Research Article| June 01, 2011 Does decreasing paraglacial sediment supply slow knickpoint retreat? John D. Jansen; Jansen 1School of Geographical and Earth Sciences, University Glasgow, Glasgow G12 8QQ, UK2Department Physical Geography Quaternary Geology, Stockholm University, S-106 91 Stockholm, Sweden Search for other works by this author on: GSW Google Scholar Derek Fabel; Fabel UK Paul Bishop; Bishop Sheng Xu; Xu 3AMS Laboratory, Scottish Universities Environmental Centre, East...

Abstract Although alluvial cutoffs record accurately the geometry, bedforms, and bed material of channel when last active, few attempts have been made to use in studies changes. A detailed historical changes on lower Hunter River southeastern Australia has shown that this responds naturally alternating periods high low flood activity, called flood‐ drought‐dominated regimes respectively. Sinuosity decreased from 3·84 1870, 2·66 1893 1·38 1970 through development eight cutoffs. The also...

We integrated optically stimulated luminescence dating and 10 Be cosmogenic nuclide measurements to quantify short‐to‐medium‐term (10 2 –10 4 years) catchment dynamics response active tectonics. In the 27 km Río Torrente catchment, Sierra Nevada, southern Spain, rapid base‐level fall has triggered knickpoint migration up both trunk tributary channels, resulting in two distinct geomorphic zones: (1) a steep lower with concordant rates of hillslope erosion channel incision over short (100...

Early Miocene basaltic lavas that flowed into river systems in central eastern New South Wales are still preserved as sinuous hill-top cappings. They permit reconstruction of many the characteristics and allow for comparison with adjacent modern counterparts these rivers. The long profiles both valleys rather similar apparently exhibit adjustment to lithologies their channel substrates, would be proposed under Hack's condition dynamic equilibrium. Slightly less post-Early incision rivers'...

We propose that a scale‐dependent topographic signature of erodibility arises due to fluvial and glacial erosion acting on different parts the landscape at times. For 14 catchments in western Scotland, we define three levels substrate order decreasing resistance: quartzite rocks, nonquartzite zones fault‐related fracture. Then, using digital planimetric data coupled with field measurements, identify regression‐based scaling relationships between morphometric parameters two spatial scales....

Abstract The geometry of channels controls the erosion rate rivers and evolution topography following environmental change. We examine how sediment, slope, substrate interact to constrain development deglaciation test whether theoretical relationships derived from streams reacting tectonic uplift apply in these settings. Using an extensive data set channel measurements postglacial Scottish Highlands, we find that a power law width‐drainage area scaling model accounts for 81% spatial...

The timing of landscape change, post-settlement alluvium (PSA) deposition and gully erosion in the southeastern Australian Tablelands remains at centre a long-standing discussion over geomorphological effects European land-use compared with Aboriginal climate change. Few quantitative studies date onset subsequent PSA those that do determine change for individual catchments rather than across region. In this study, we present optically stimulated luminescence (OSL) burial ages swampy meadow...

Abstract. Many mountain ranges survive in a phase of erosional decay for millions years following the cessation tectonic activity. Landscape dynamics these post-orogenic settings have long puzzled geologists due to expectation that topographic relief should decline with time. Our understanding how denudation rates, crustal dynamics, bedrock erodibility, climate, and mantle-driven processes interact dictate persistence absence ongoing tectonics is incomplete. Here we explore lateral...

Research Article| February 01, 2008 Single-grain cosmogenic 21Ne concentrations in fluvial sediments reveal spatially variable erosion rates Alexandru T. Codilean; Codilean 1Department of Geographical & Earth Sciences, University Glasgow, Glasgow G12 8QQ, UK Search for other works by this author on: GSW Google Scholar Paul Bishop; Bishop Finlay M. Stuart; Stuart 2Scottish Universities Environmental Centre (SUERC), East Kilbride G75 0QF, Trevor B. Hoey; Hoey 3Department Derek Fabel; Fabel...