A5082774307- Aeolian processes and effects
- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Geological formations and processes
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Flood Risk Assessment and Management
- Landslides and related hazards
- Precipitation Measurement and Analysis
- Hydrological Forecasting Using AI
- Remote Sensing and Land Use
- Geochemistry and Geologic Mapping
- Seismic Imaging and Inversion Techniques
- Geotechnical and Geomechanical Engineering
- Fish Ecology and Management Studies
- Aerodynamics and Fluid Dynamics Research
- Astro and Planetary Science
- Climate change and permafrost
- Remote Sensing and LiDAR Applications
- Fire effects on ecosystems
- Hydraulic flow and structures
- Climate variability and models
- Fluid Dynamics and Vibration Analysis
- Marine and environmental studies
University of Hull
2022-2025
Université Paris Cité
2017-2024
Institut de physique du globe de Paris
2015-2024
Université de Lorraine
2024
University of Southampton
2020-2023
A large number of historical simulations and future climate projections are available from Global Climate Models, but these typically coarse resolution, which limits their effectiveness for assessing local scale changes in attendant impacts. Here, we use a novel statistical downscaling model capable replicating extreme events, the Bias Correction Constructed Analogues with Quantile mapping reordering (BCCAQ), to downscale daily precipitation, air-temperature, maximum minimum temperature,...
Abstract. Precipitation is the most important driver of hydrological cycle, but it challenging to estimate over large scales from satellites and models. Here, we assessed performance six global quasi-global high-resolution precipitation datasets (European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis version 5 (ERA5), Climate Hazards group Infrared with Stations 2.0 (CHIRPS), Multi-Source Weighted-Ensemble 2.80 (MSWEP), TerraClimate (TERRA), Prediction Unified 1.0 (CPCU),...
<title>Abstract</title> Over a billion people globally are already exposed to the risk of flooding, but by 2050 this number is expected double due human-induced climate change, population growth, and encroachment into at-risk areas. Global Flood Models (GFMs) vital tools for producing flood hazard maps supporting impact estimates policy interventions. These GFMs represent river channels typically assuming that bankfull flow-carrying capacity equates flow with specified return period (RP)...
Flood risk is increasing worldwide, however, studies on river geomorphological responses to floods often lack explicit consideration of anthropogenic impacts rivers. A pervasive impact human modification has been the conversion anabranching riverscapes incised, single thread, so called &#8216;fire-hose&#8217; channels. However, consequences such for functioning are poorly understood, restricting our ability manage flood in modified systems or restore these riverscapes. Therefore, we...
The incision of bedrock by rivers is a key process that controls river morphology, drives valley downcutting, determines the evolution hillslopes base level, and shapes landscapes. Understanding mechanisms fluvial erosion therefore crucial in geomorphology. In this study, we investigate factors controlling rates, both experimentally to document pebble abrasion field highlight respective roles block detachment. Experimentally, use an annular flume simulate different hydrodynamic conditions...
Emergence and growth of sand dunes result from the dynamic interaction between topography, wind flow sediment transport. While feedbacks these variables are well studied at scale a single relatively small dune, average effect periodic large-scale dune pattern on atmospheric flows remains poorly constrained, due to pressing lack data in major seas. Here, we compare local measurements surface winds predictions ERA5-Land climate reanalysis four locations Namibia, both within outside giant...
Sand patches are one of the precursors to early-stage protodunes and occur widely in both desert coastal aeolian environments. Here we show field evidence a mechanism explain initiation sand on non-erodible surfaces, such as gravels moist beaches. Changes transport dynamics, directly associated with height saltation layer variable law, observed at boundary between erodible surfaces lead deposition surface. This explains how can form limited availability where linear stability dune theory...
Using laboratory experiments, we investigate the influence of water and sediment discharges on morphology an alluvial fan. In our flume, a single-thread laminar river deposits corundum sand into conical We record fan progradation with top-view images measure its shape using deformation Moiré pattern. The remains virtually self-affine as it grows, nearly constant slope. find that, when discharge is small, longitudinal slope close to that at threshold for transport. Consequently depends only....
Abstract Early‐stage bedforms develop into mature dunes through complex interactions between wind, sand transport, and surface topography. Depending on varying environmental wind conditions, the mechanisms driving dune formation and, ultimately, shape of nascent may differ markedly. In cases where availability is plentiful, emergence growth can be studied with a linear stability analysis coupled transport hydrodynamic equations. Until now, this has only been applied using field evidence in...
Abstract. Using laboratory experiments, we investigate the growth of an alluvial fan fed with two distinct granular materials. Throughout fan, its surface maintains a radial segregation, less mobile sediment concentrated near apex. Scanning laser, find that transition between proximal and distal deposits coincides slope break. A cross section reveals stratigraphy records signal this segregation. To interpret these observations, conceptualize as radially symmetric structure geometry it grows....
Over 70% of flood events recorded in the past two decades Global Flood Database and WorldFloods dataset have occurred locations where complex channel systems occur. Here we define as parts river network that diverge, such bifurcations, multi-threaded channels, canals deltas. Yet, large scale models have, until now, used only single-threaded networks due to lack a reflects . Therefore, these large-scale fundamentally misrepresent physical processes often highly populated areas, leading...
Abstract Decimeter‐scale early‐stage aeolian bedforms represent topographic features that differ notably from their mature dune counterparts, with nascent forms exhibiting more gently sloping lee sides and a reverse asymmetry in flow‐parallel bed profile compared to dunes. Flow associated the development of these “protodunes,” wherein crest gradually shifts downstream towards its state, was investigated by studying perturbation turbulent boundary layer over succession representative...
Climate variability is a significant driver of flood events. However, geomorphological changes in river channels, including variations local and upstream sediment supply, play crucial role determining conveyance capacity stage variations. The interplay between hydrology geomorphology, their relative impact on conveyance, can vary different systems depending both the degree internal channel dynamics nature magnitude external forcings. For example, rates bank erosion, vegetation establishment...
Sand patches are one of the early stages aeolian bedforms. They form onnon-erodible surfaces in both desert and coastal environments. Their initiation is associated with thechange saltation transport law on rigid granular beds [1]. Here wepresent a two-dimensional model that couples these surface-dependenttransport laws feedback bed elevation wind flow.Analysing spatio-temporal evolution an initial very flat sandpatch, we emphasise central role input flux as well thelengthscale over which...
The accurate estimation of bankfull discharge (QBF) plays a central role in multiple disciplines including geomorphology, hydrology, and ecology. For example, is an essential input many large-scale flood models which are widely used understanding risk across large scales. However, the context extremely limited observations, these Global Flood Models (GFMs) typically assume that has spatially uniform recurrence interval, with value 1-2 years adopted. In reality, studies have found highly...
<title>Abstract</title> The maximum amount of water rivers can transport before flooding is known as the bankfull discharge, an essential threshold for flood risk and biogeochemical cycles. Current Global Flood Models rely on untested assumption a spatially-invariant, 2-year recurrence. Here, based observations machine learning, we deliver first global estimation discharge in different climates along new bifurcating river network at ~ 1 km spatial resolution. In contrast to assumption, find...
Abstract. Using laboratory experiments, we investigate the growth of an alluvial fan fed with two distinct granular materials. Throughout fan, its surface maintains a radial segregation, less mobile sediment concentrated near apex. Scanning laser, find that transition between proximal and distal deposits coincides slope break. A cross-section reveals stratigraphy deposit bears mark this consistent segregation. To interpret these observations, conceptualize as radially symmetric structure...