A5047581591- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Tropical and Extratropical Cyclones Research
- Coastal and Marine Dynamics
- Climate variability and models
- Arctic and Antarctic ice dynamics
- Wave and Wind Energy Systems
- Differential Equations and Numerical Methods
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Advanced Numerical Methods in Computational Mathematics
- Engineering and Technology Innovations
- Image and Signal Denoising Methods
- Mathematical Analysis and Transform Methods
- Earthquake and Tsunami Effects
- COVID-19 epidemiological studies
- Asphalt Pavement Performance Evaluation
- Maritime Navigation and Safety
- Vibration and Dynamic Analysis
- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Mathematical and Theoretical Epidemiology and Ecology Models
- Digital Filter Design and Implementation
- Geological and Geophysical Studies
- Chaos-based Image/Signal Encryption
Hasanuddin University
2007-2024
The University of Melbourne
2019-2023
Bureau of Meteorology
2023
Swinburne University of Technology
2013-2014
In this study, global satellite data were analyzed to determine trends in oceanic wind speed and significant wave height over the 33-year period from 1985 2018. The analysis uses an extensive database obtained 31 missions comprising three types of instruments—altimeters, radiometers, scatterometers. shows small increases mean period, with larger extreme conditions (90th percentiles). largest occur Southern Ocean. Confidence results is strengthened because are confirmed by all systems. An set...
Abstract This dataset consists of 33 years (1985 to 2018), global significant wave height and wind speed obtained from 13 altimeters, namely: GEOSAT , ERS-1 TOPEX ERS-2 GFO JASON-1 ENVISAT JASON-2 CRYOSAT-2 HY-2A SARAL JASON-3 SENTINEL-3A . The altimeter data have been calibrated validated against National Oceanographic Data Center (NODC) buoy data. Differences between as a function time are investigated for long-term stability. A cross validation altimeters is also carried out in order...
Abstract Global wave hindcasts are developed using the third generation spectral model WAVEWATCH III with observation‐based source terms (ST6) and a hybrid rectilinear‐curvilinear, irregular‐regular‐irregular grid system (approximately at ). Three distinct global produced: (a) long‐term hindcast (1979–2019) forced by ERA5 conventional winds (b) two short‐term (2011–2019) driven NCEP climate forecast (CFS)v2 neutral , respectively. The input field for ice is sourced from Ocean Sea Ice...
The accuracy of wind speed measurements is important in many applications. In the present work, error standard deviations measured by satellites and National Data Buoy Center (NDBC) buoys were estimated using triple collocation. included six altimeters, three scatterometers, four radiometers. altimeters TOPEX, ERS-2, JASON-1, ENVISAT, JASON-2, CRYOSAT-2, whilst scatterometers QUIKSCAT, METOP-A, METOP-B radiometers SSMI-F15, AMSR-2, WINDSAT, GMI. Hence, a total 14 platform measurements,...
A long-duration, multi-mission altimeter dataset is analyzed to determine its accuracy in determining long-term trends significant wave height. Two calibration methods are investigated: “altimeter–buoy” and “altimeter–altimeter” calibration. The approach shows larger positive globally, but both approaches subject temporal non-homogeneity between missions. This limits the of such datasets approximately ±0.2 cm/year sampling pattern altimeters also investigated if under-sampling impacts...
Abstract Global ocean wind speed observed from seven different scatterometers, namely, ERS-1 , ERS-2 QuikSCAT, MetOp-A OceanSat-2 MetOp-B and Rapid Scatterometer (RapidScat) were calibrated against National Data Buoy Center (NDBC) data to form a consistent long-term database of direction. Each scatterometer was independently NDBC buoy then cross validation between scatterometers performed. The total duration all is approximately 27 years, 1992 until 2018. For calibration purposes, only buoys...
Abstract A very large database containing 24 years of scatterometer passes is analyzed to investigate the surface wind fields within tropical cyclones. The analysis confirms left–right asymmetry field with strongest winds directly right cyclone center (Northern Hemisphere). At values greater than 2 times radius maximum winds, approximately equal storm velocity forward movement. Observed inflow angle (i.e., motion not subtracted) shown vary both radially and azimuthally cyclone. smallest...
Abstract Linear instability of two-dimensional wave fields and its concurrent evolution in time is here investigated by means the Alber equation for narrow-banded random surface waves deep water subject to inhomogeneous disturbances. The probability freak context these simulations also discussed. first studied symmetric Lorentz spectrum, continued realistic asymmetric Joint North Sea Wave Project (JONSWAP) spectrum ocean with variable directional spreading steepness. It found that depends on...
The joint extremal spatial dependence of wind speed and significant wave height in the North East Atlantic is quantified using Metop satellite scatterometer hindcast observations for period 2007–2018, a multivariate conditional extremes (MSCE) model, ultimately motivated by work Heffernan Tawn (2004). analysis involves (a) registering individual swaths corresponding data onto template transect (running approximately north-east to south-west, between British Isles Iceland), (b) non-stationary...
Abstract Extreme significant wave height estimates, and their probability of exceedance, are fundamental offshore coastal engineering design parameters. These estimates characterized by uncertainty due to an incomplete understanding the atmosphere‐ocean energy momentum exchanges during intense storms. This particularly affects extreme statistics ocean regions exposed large frequent synoptic disturbances such as Extra‐Tropical Cyclones (ETCs). In this work, we assessed performance global...
A 27-year-long calibrated multi-mission scatterometer data set is used to determine the global basin-scale and near-coastal wind resource. In addition mean percentile values, analysis also determines values of both 50- 100-year return period speeds. The clearly shows seasonal variability speeds differing response two hemispheres. maximum in each hemisphere are comparable but there a much larger cycle northern hemisphere. As result, southern has more consistent year-round climate. Hence,...
The advection-diffusion equation or transport is investigated further. A simple numerical approximation such as Du-Fort Frankel methods for with variable coefficient employed. obtained results are compared its analytical solution in a unit square domain. method and then being used to solve the real-world problems more complicate irregular
A preliminary assessment of wave energy resource around Indonesian's ocean has been carried out by means analyzing satellite observations. The flux or power can be approximated using parameterized sea states. Wave scales with significant height, characteristic period and water depth. In this approach, the heights were obtained from ENVISAT (Environmental Satellite) data which have calibrated. However, as is rarely specified therefore must estimated other variables when information about...
Abstract The extremal spatial dependence of significant wave height in the North East Atlantic is explored using Joint Altimetry Satellite Oceanography Network satellite altimeter observations for period 2002–2018, and a conditional extremes model motivated by work Heffernan Tawn. analysis involves (a) registering individual passes onto template transect, (b) marginal extreme value at set locations on transect transformation from physical to standard Laplace scale, (c) estimation (d)...
Abstract Four scatterometers, namely: METOP-A, METOP-B, ERS-2 and OCEANSAT-2 were re-calibrated against combined National Data Buoy Center (NDBC) data aircraft Stepped Frequency Microwave Radiometer (SFMR) from hurricanes. As a result, continuous calibration relations over the wind speed range 0 to 45 ms -1 developed. The process uses match-up criteria of 50 km 30 min for buoy data. However, due strong spatio-temporal gradients in hurricanes, method which considers both scatterometer SFMR...
Abstract The dataset consists of ocean surface wind speed and direction at 10 m height 1 km spatial resolution around the wider Australian coastal areas, spanning 4 years (2017 to 2021) measurements from Sentinel-1 A B imaging Synthetic Aperture Radar (SAR) platforms. winds have been derived using a consistent SAR retrieval algorithm, processing full archive in this region. data are appropriately quality controlled, flagged, archived as NetCDF files representing field maps aligned with...
In this paper we investigate the breaking of long-waves propagating on shallow water with nonlinear friction sloping bottom.A complete set equations is presented and a numerical method developed to simulate wave propagation.The uses an up-wind difference scheme for convective term central other derivative terms.Various examples have been conducted effect drag coefficient propagation breaking.By analyzing results, find that in order overcome breaking, needs be below certain level.
This paper describes a numerical solution for mathematical model of the transport equation in simple rectangular box domain. The street tunnel pollution distribution using two-dimension advection and three-dimension diffusion is solved numerically. Because nature problem, extended to become study sea-sand mining distribution. with various parameters boundaries conditions also numerically finite difference (FTCS) method.
Abstract Dengue is a tropical infectious disease caused by dengue virus which transmitted mosquitos such as Aedes Aegypti and Albopictus. The spread of this could be controlled applying some optimal strategies. In research, we study strategy in controlling the taking into consideration an integrated vector control strategy. combines chemical non-chemical methods to prevent transmission vector-borne disease. If assume that functions are constant then numerically obtain critical leads...