Erosion rates dictate the morphology of landscapes, and therefore quantifying them is a critical part many geomorphic studies. Methods to directly measure erosion are expensive time consuming, whereas topographic analysis facilitates prediction rapidly over large spatial extents. If hillslope sediment flux nonlinearly dependent on slope then curvature hilltops will be linearly proportional rates. In this contribution we develop new techniques extract hilltop networks sample their adjacent...

Fluvial landscapes are dissected by channels, and at their upstream termini channel heads.Accurate reconstruction of the fluvial domain is fundamental to understanding runoff generation, storm hydrology, sediment transport, biogeochemical cycling, landscape evolution.Many methods have been proposed for predicting head locations using topographic data, yet none tested against a robust field data set mapped heads across multiple landscapes.In this study, four prediction were from sites with...

Abstract. The characteristics of the sediment transported by rivers (e.g. flux, grain size distribution – GSD) dictate whether aggrade or erode their substrate. They also condition architecture and properties sedimentary successions in basins. In this study, we investigate relationship between landscape steepness hillslope fluvial sediments. study area is located within Feather River basin northern California, studied basins are underlain exclusively tonalite lithology. Erosion rates vary...

Rising sea levels and increased storminess are expected to accelerate the erosion of soft-cliff coastlines, threatening coastal infrastructure livelihoods. To develop predictive models future change we need fundamentally know how rapidly coasts have been eroding in past, understand driving mechanisms change. Direct observations cliff retreat rarely extend beyond 150 y, during which humans significantly modified system. Cliff rates unknown prior centuries millennia. In this study, derived...

Abstract. For over a century, geomorphologists have attempted to unravel information about landscape evolution, and processes that drive it, using river profiles. Many studies combined new topographic datasets with theoretical models of channel incision infer erosion rates, identify rock types different resistance erosion, detect potential regions tectonic activity. The most common metric used analyse profile geometry is steepness, or ks. However, the calculation steepness requires...

Abstract The concavity index, , describes how quickly river channel gradient declines downstream. It is used in calculations of normalized steepness a metric for comparing the relative channels with different drainage area. also calculating transformed longitudinal coordinate, which has been employed to search migrating divides. A value 0.45 typically assumed studies. Here we quantify variability across multiple landscapes distributed globe. We describe degree both spatial distribution and...

Abstract. Floodplain and terrace features can provide information about current past fluvial processes, including channel response to varying discharge sediment flux, storage, the climatic or tectonic history of a catchment. Previous methods identifying floodplain terraces from digital elevation models (DEMs) tend be semi-automated, requiring input independent datasets manual editing by user. In this study we present new method based on two thresholds: local gradient, compared nearest...

Earth's surface archives the combined history of tectonics and erosion, which tend to roughen landscapes, sediment transport deposition, smooth them. We analyzed hillslope morphology in tectonically active Dragon's Back Pressure Ridge California, United States, assess whether tectonic uplift can be reconstructed using measurable attributes features within landscapes. Hilltop curvature relief mirror measured rates vertical displacement caused by forcing, their relationships are consistent...

Many geomorphic studies assume that bedrock geology is not a first‐order control on landscape form in order to isolate drivers of change (e.g., climate or tectonics). Yet underlying may influence the efficacy soil production and sediment transport hillslopes. We performed quantitative analysis LiDAR digital terrain models examine topographic hillslopes two distinct lithologies Feather River catchment northern California, granodiorite pluton metamorphosed volcanics. The sites, separated by...

Abstract. We report a new program for calculating catchment-averaged denudation rates from cosmogenic nuclide concentrations. The method (Catchment-Averaged denudatIon Rates Nuclides: CAIRN) bundles previously reported production scaling and topographic shielding algorithms. In addition, it calculates on pixel-by-pixel basis. explore the effect of sampling frequency across both azimuth (Δθ) altitude (Δϕ) angles show that in high relief terrain relatively is required, with good balance...

Abstract Hillslope length is a fundamental attribute of landscapes, intrinsically linked to drainage density, landslide hazard, biogeochemical cycling and hillslope sediment transport. Existing methods estimate catchment average lengths include inversion density or identification break in slope–area scaling, where the domain transitions into fluvial domain. Here we implement technique which models flow from point sources on hilltops across pixels digital elevation model (DEM), based...

Abstract. Changes in the steepness of river profiles or abrupt vertical steps (i.e. waterfalls) are thought to be indicative changes erosion rates, lithology other factors that affect landscape evolution. These referred as knickpoints knickzones and pervasive bedrock systems. Such features reveal information about evolution patterns erosion, therefore their locations often reported geomorphic literature. It is imperative studies reporting use a reproducible method quantifying locations,...

ABSTRACT Natural flood management (NFM) has gained prominence as a risk approach in temperate settings but lacks extensive applied examples and evidence tropical settings, despite significant ecosystem degradation high exposure. Tropical river catchments often experience highly variable hydrographs (i.e., prone to flash floods) intense rainfall from monsoon typhoon‐dominated weather systems that can cause landslides sediment‐transporting flows. These conditions provide backdrop the prospects...

We use a new exploratory model that simulates the evolution of sandy coastlines over decadal to centennial timescales examine behavior crenulate-shaped bays forced by differing directional wave climates. The represents coastline as vector in Cartesian reference frame, and shoreface evolves relative its local orientation, allowing simulation coasts with high planform-curvature. Shoreline change is driven gradients alongshore transport following newly developed algorithms facilitate dealing...

Abstract Predicted sea-level rise and increased storminess are anticipated to lead increases in coastal erosion. However, assessing if how rocky coasts will respond changes marine conditions is difficult due current limitations of monitoring modelling. Here, we measured cosmogenic 10 Be concentrations across a sandstone shore platform North Yorkshire, UK, model the erosion within last 7 kyr for first time quantify relative long-term erosive contribution landward cliff retreat, down-wearing...

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...

Coastal response to anthropogenic climate change is of central importance the infrastructure and inhabitants in these areas. Despite being globally ubiquitous, stability rock coasts has been largely neglected, expected acceleration cliff erosion following sea-level rise not tested with empirical data, until now. We have optimised a coastal evolution model topographic cosmogenic radionuclide data quantify retreat rates for past 8000 years forecast next century. Here we show that will increase...

Abstract Public satellite platforms offer regular observations for global coastal monitoring and climate change risk management strategies. Unfortunately, shoreline positions derived from imagery, representing changes in intertidal topography, are noisy subject to tidal bias that requires correction. The seaward‐most vegetation boundary reflects a indicator which shifts on event–decadal timescales, informs practitioners of storm damage, sediment availability landform health. We present...

Abstract. Considering the relationship between erosion rate and relief structure of a landscape within nondimensional framework facilitates comparison landscapes undergoing forcing at range scales, allows broad-scale patterns evolution to be observed. We present software which automates extraction processing relevant topographic parameters rapidly generate data for any where high-resolution are available. Individual hillslopes identified using connected-components technique spatial averaging...

Resilient coastal protection requires adaptive management strategies that build with nature to maintain long-term sustainability. With increasing pressures on shorelines from urbanisation, industrial growth, sea-level rise and changing storm climates soft approaches are implemented support natural habitats healthy ecosystems. The impact of a beach mega-nourishment along frontage interactive engineered systems incorporate hard defences is explored. A evolution model applied simulate the...

Abstract. Linking landslide size and frequency is important at both human geological timescales for quantifying hazards the effectiveness of landslides in removal sediment from evolving landscapes. The statistical behaviour magnitude-frequency inventories usually compiled following a particular triggering event such as an earthquake or storm, their often characterised by power-law relationship with small rollover. occurrence expected to be influenced material properties rock and/or regolith...

Abstract Tectonic plate motion, and the resulting change in land surface elevation, has been shown to have a fundamental impact on landscape morphology. Changes uplift rates can drive response fluvial channels, which then drives changes hillslopes. Because hillslopes respond different time scales than investigating geometry of channels concert provides novel opportunities examine how may changed through time. Here we perform coupled topographic analysis channel hillslope across series...

Abstract The majority of shore platforms form in rocks that are characterised by layered stratigraphy and pervasive jointing. Plucking weathered, joint bed bounded blocks is an important erosion process existing models platform development do not represent. Globally, measuring rates have focused on microscale (< 1 mm) surface lowering rather than mesoscale (0.1‐1 m) block detachment, yet the latter appears to dominate morphological discontinuity rich platforms. Given sporadic nature...

Abstract We demonstrate that river discharge can be estimated by deriving water surface velocity estimates from satellite‐derived video imagery when combined with high‐resolution topography of channel geometry. Large Scale Particle Image Velocimetry (LSPIV) was used to map 28 s 5 Hz satellite acquired at a 1.2 m nominal ground spacing over the Darling River, Tilpa, Australia, during 1‐in‐5‐year flood. stabilized and assessed uncertainty residual motion induced platform, enhancing our...