A5059318470- Radio Astronomy Observations and Technology
- Electromagnetic Compatibility and Measurements
- Meteorological Phenomena and Simulations
- Precipitation Measurement and Analysis
- Antenna Design and Optimization
- Climate variability and models
- Soil Moisture and Remote Sensing
- Flood Risk Assessment and Management
- Tropical and Extratropical Cyclones Research
- Hydrology and Watershed Management Studies
- Cryospheric studies and observations
- Hydrology and Drought Analysis
- Atmospheric aerosols and clouds
- Satellite Communication Systems
- Radio Wave Propagation Studies
- Hydrological Forecasting Using AI
- Ionosphere and magnetosphere dynamics
- Landslides and related hazards
- Urban Heat Island Mitigation
- Complex Systems and Time Series Analysis
- Wireless Communication Networks Research
- 3D Modeling in Geospatial Applications
- Oceanographic and Atmospheric Processes
- Soil erosion and sediment transport
- Tree-ring climate responses
UNSW Sydney
2020-2025
ARC Centre of Excellence for Climate System Science
2022-2025
Australian Research Council
2024
École Polytechnique Fédérale de Lausanne
2013-2023
Oeschger Centre for Climate Change Research
2018-2021
University of Bern
2018-2021
University of Lausanne
2014
Data61
2006-2013
CSIRO Land and Water
2011-2013
Australian National University
2006
Abstract. The raindrop size distribution (DSD) quantifies the microstructure of rainfall and is critical to studying precipitation processes. We present a method improve accuracy DSD measurements from Parsivel (particle velocity) disdrometers, using two-dimensional video disdrometer (2DVD) as reference instrument. disdrometers bin raindrops into velocity equivolume diameter classes, but may misestimate number drops per class. In our correction method, drop velocities are corrected with...
Abstract Commonly used disdrometers tend not to accurately measure concentrations of very small drops in the raindrop size distribution (DSD), either through truncation DSD at small-drop end or because large uncertainties on these measurements. Recent studies have shown that, as a result inaccuracies, many if most ground-based do capture “drizzle mode” precipitation, which consists and is often separated from main part by shoulder region. We present technique for reconstructing drizzle mode...
Abstract. The first hydrometeor classification technique based on two-dimensional video disdrometer (2DVD) data is presented. method provides an estimate of the dominant type falling over time intervals 60 s during precipitation, using statistical behavior a set particle descriptors as input, calculated for each image. employed supervised algorithm support vector machine (SVM), trained precipitation steps labeled by visual inspection. In this way, eight classes can be discriminated. achieved...
Abstract. In the last decade there has been a growing interest from hydrometeorological community regarding rainfall estimation commercial microwave link (CML) networks. Path-averaged intensities can be retrieved signal attenuation between cell phone towers. Although this technique is still in development, it offers great opportunities for retrieval of rates at high spatiotemporal resolutions very close to Earth's surface. Rainfall measurements are highly valued urban hydrology, instance,...
Hail can injure people and damage infrastructure, with hailstorms a driving cause of insured losses. Hailstorms are expected to be affected by global warming, primarily via changes atmospheric instability, wind shear, the height melting level. However, nuances remain uncertain generally only studied regionally, partly because climate models typically lack fine grid spacing required explicitly resolve hailstorms. Here, we show projections using an ensemble four hail proxies estimate...
Abstract Hailstorms are destructive and dangerous phenomena that can cause large losses, motivating better understanding of their occurrence. As climate modes variability influence temperature moisture hence convective instability, they offer predictive skill for hail conditions. Here, we examine relationships between hail‐prone days across Australia the El Niño–Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), Southern Annular Mode (SAM). Hail‐prone were identified using a proxy...
Abstract Blended high‐resolution sub‐hourly precipitation fields are increasingly needed for nowcasting and automatic warnings systems. Here we present a 7‐year (2012–2018) assessment of (5‐min) characteristics the topographically complex region Switzerland. We use CombiPrecip, blended radar—rain‐gauge product that provides high resolution (1 km 2 ) hourly fields. Five‐minute (CPCD), fine enough to disentangle even shortest convective events from longer‐lasting precipitation, obtained by...
Abstract Many applications in urban areas require high‐resolution rainfall measurements. Typical operational weather radars can provide intensities at 1‐km 2 grid cells every 5 min. Opportunistic sensing with commercial microwave links yields path‐averaged (typically 0.1–10 km) within areas. Additionally, large amounts of situ measurements from amateur observers are obtainable real‐time. The accuracy these three techniques is evaluated for an study area 20 × km, taking into account their...
Abstract. A new technique for estimating the raindrop size distribution (DSD) from polarimetric radar data is proposed. Two statistical moments of DSD are estimated variables, and reconstructed using a double-moment normalisation. The takes advantage relative invariance normalised DSD. method was tested X-band networks disdrometers in three different climatic regions. Radar-derived estimates compare reasonably well to observations. In domains, terms moments, rain rate, characteristic drop...
Abstract. A comprehensive hydrometeorological dataset is presented spanning the period 1 January 2011–31 December 2014 to improve understanding of hydrological processes leading flash floods and relation between rainfall, runoff, erosion sediment transport in a mesoscale catchment (Auzon, 116 km2) Mediterranean region. Badlands are present Auzon well connected high-gradient channels bedrock rivers which promotes transfer suspended solids downstream. The number observed variables, various...
Abstract The drop size distribution (DSD) describes the microstructure of liquid precipitation. high variability DSD reflects variety microphysical processes controlling raindrop properties and affects retrieval rainfall. An analysis effects subgrid on areal estimation precipitation is presented. Data used were recorded with a network disdrometers in Ardèche, France. was studied over two typical scales: 5 km × km, similar to ground footprint Global Precipitation Measurement (GPM) spaceborne...
In this paper we consider the issues involved in 3D mapping of object surface temperatures from a system thermal and normal stereo cameras. Of particular focus are related to integrated camera calibration using common visible grid development robust algorithms that allow for seamless temperature calculations. Finally have examined class objects can robustly apply as well pinpoint deficiencies such approaches calculations
Abstract Double-moment normalization of the drop size distribution (DSD) summarizes DSD in a compact way, using two its statistical moments and “generic” double-moment normalized function. Results are presented an investigation into invariance through horizontal vertical displacement space, data from disdrometers, vertically pointing K-band Micro Rain Radars, X-band polarimetric weather radar. The is tested over range up to 1.8 km approximately 100 km. results suggest that for practical use,...
We present a new approach for spatial interpolation of experimental raindrop size distribution (DSD) spectra. The DSD is fundamental to the study and understanding precipitation its monitoring modelling. It measured insitu using disdrometers at point locations. Disdrometers provide (non‐parametric) spectrum in which drop concentrations are provided per class diameter. Our uses geostatistics estimate same non‐parametric unmeasured Non‐stationarity due intermittency taken into account through...
Abstract Hail damage is a leading cause of insured losses in Australia, but changes this hazard have not been robustly quantified. Here, we provide continental-scale analysis hail Australia. A proxy applied to reanalysis data shows that from 1979–2021 annual hail-prone days decreased over much Australia increased some heavily populated areas. For example, the number by ~40% around Sydney and Perth, largest cities on Australia’s east west coasts, respectively. Changes atmospheric instability...
Abstract. The lower-order moments of the drop size distribution (DSD) have generally been considered difficult to retrieve accurately from polarimetric radar data because these are related higher-order moments. For example, 4.6th moment is associated with a specific differential phase and 6th reflectivity ratio high-order reflectivity. Thus, conventionally, emphasis has estimate rain rate (3.67th moment) or parameters exponential gamma for DSD. Many double-moment “bulk” microphysical schemes...
Abstract. We present a feasibility study for an object-based method to characterise thunderstorm properties in simulation data from convection-permitting weather models. An existing tracker, the Thunderstorm Identification, Tracking, Analysis and Nowcasting (TITAN) algorithm, was applied thunderstorms simulated by Advanced Research Weather Forecasting (AR-WRF) model at resolution domain centred on Switzerland. Three WRF microphysics parameterisations were tested. The results are compared...
Abstract. The raindrop size distribution (DSD) quantifies the micro-structure of rainfall and is critical to studying precipitation processes. We present a method improve accuracy DSD measurements from Parsivel disdrometers, using two-dimensional-video-disdrometer (2DVD) as reference instrument. disdrometers bin recorded raindrops into velocity equivolume diameter classes, but may mis-estimate number drops per class. define filter for raw disdrometer remove particles that are unlikely be...
The detectability of nocturnal carnivores is very low, because such data on many species can be difficult to acquire. Here, we design an automatic thermal video recording system for studying cryptic mammalian predators at food and water resources in Australia. We trialed different sampling procedures contrasting environments between August 2005 February 2006 identify aspects survey that influenced interpretability. then compared the accuracy remote direct human observation. found our most...