A5040430237- Tropical and Extratropical Cyclones Research
- earthquake and tectonic studies
- Flood Risk Assessment and Management
- Disaster Management and Resilience
- Coastal and Marine Dynamics
- Earthquake and Tsunami Effects
- Geological and Geophysical Studies
- Hydrology and Drought Analysis
- Infrastructure Resilience and Vulnerability Analysis
- Geological formations and processes
- Climate change impacts on agriculture
- Geophysics and Gravity Measurements
- Coastal wetland ecosystem dynamics
- Ocean Acidification Effects and Responses
- Risk and Safety Analysis
- Climate Change, Adaptation, Migration
- Hydrology and Watershed Management Studies
- Seismology and Earthquake Studies
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Climate Change and Sustainable Development
- Atmospheric and Environmental Gas Dynamics
- Seismic Performance and Analysis
- Scientific Research and Discoveries
- Arctic and Antarctic ice dynamics
National Institute of Water and Atmospheric Research
2019-2025
University of Auckland
2021-2024
New Zealand Association of Counsellors
2022-2023
University of Canterbury
2022
Auckland Council
2010
Victoria University of Wellington
2006-2008
The prevalence of cascading failures is growing as infrastructure becomes more interdependent and climate change exacerbates extreme hazards. After such events, the general focus on magnitude direct damage or loss; it less understood how events trigger throughout other infrastructure. In this work, we present a methodology to model indirect impacts from an event for multi-system network, including interconnected end users. We perform case study New Zealand's second largest city,...
Abstract Anticipating and managing the impacts of sea‐level rise for nations astride active tectonic margins requires understanding rates sea surface elevation change in relation to coastal land elevation. Vertical motion (VLM) can either exacerbate or reduce changes with varying significantly along a coastline. Determining rate, pattern, variability VLM near coasts leads direct improvement location‐specific relative level (RSL) estimates hazard risk assessment. Here, we utilize vertical...
Abstract This paper presents the architecture and features of RiskScape software. is an open-source software with a flexible modelling engine for multi-hazard risk analysis. The implements modeller-defined quantification workflows as ‘model pipelines’. Model pipeline steps functions analyse hazard, exposure, vulnerability data across different spatio-temporal domains using geoprocessing spatial sampling operations. supports deterministic probabilistic quantification, several...
Coastal flooding from extreme sea levels will increase in frequency and magnitude as global climate change forces sea-level rise (SLR). Extreme events, rare the recent past (i.e., once per century), are projected to occur at least year by 2050 along many of world’s coastlines. Information showing where how built-environment exposure increases with SLR, enables timely adaptation before damaging thresholds reached. This study presents a first national-scale assessment New Zealand’s future...
Abstract Flood damage assessments provide critical insights on processes controlling building and loss. Here, we present a novel assessment approach to develop an empirical residential database from five flood events in New Zealand. Object‐level data was collected for hazard characteristics, along with relative component sub‐components ratios. A Random Forest Model Spearman's Rank correlation test were applied analyse variable importance monotonic relationships. results reveal inundation...
Episodic inundation from extreme sea-levels (ESLs) will have increasing social and economic impacts in response to relative sea level rise (RSLR). Despite the improved global understanding of ESL frequencies magnitudes, detailed nationwide maps are unavailable for many countries. This study quantifies New Zealand’s land area exposure ESLs RSLR by: (i) calculating heights nine annual recurrence intervals (ARI) between 2 1,000-years, (ii) converted into space-varying water surface grids, (iii)...
Abstract One of the longest standing debates in rocky coast geomorphology is whether subaerial weathering or wave processes dominate shore platform evolution. The origins this debate date to mid‐nineteenth century when first descriptions Old Hat Islands were provided from northern New Zealand. are surrounded by a broad near‐horizontal platform. Their formation was inferred relate bedrock level permanent saturation with acting only remove weathered debris. To date, no detailed topographic...
Abstract We developed tsunami fragility functions using three sources of damage data from the 2018 Sulawesi at Palu Bay in Indonesia obtained (i) field survey (FS), (ii) a visual interpretation optical satellite images (VI), and (iii) machine learning remote sensing approach utilized on multisensor multitemporal (MLRS). Tsunami are cumulative distribution that express probability structure reaching or exceeding particular state response to specific intensity measure, this case interpolation...
Global sea-level rise (SLR) is expected to increase the frequency of extreme sea level (ESL) flooding. Flood mitigation strategies often focus on reducing built-asset exposure relatively infrequent but high magnitude ESL events, though frequent lower events in response SLR could accumulate be more costly for urban areas. We analyse this phenomenon twenty major coastal areas New Zealand by quantifying average annual building replacement value (AAERV) within 1–10, 10–50 and 50–100-year...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Earth's Future. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]The significance of vertical land movements convergent plate boundaries in probabilistic sea-level projections AR6 scenarios: The New Zealand case.AuthorsTimNaishiDRichard H.LevyiDIan...
Changes in global mean sea level are a clear indicator of warming climate, but local factors including land subsidence or uplift, cause changes relative that drive shoreline shifts. These and their impact on coastal hazards matter to communities. NZ SeaRise produced projections for Aotearoa include the latest climate Antarctic Ice Sheet research estimates vertical movement at high spatial resolution. Research-informed communication public planners included web-based tool supplemented by...
Abstract Reliable flood damage models are informed by detailed assessments. Damage critical in risk assessments, representing an elements vulnerability to damage. This study evaluated residential building for the July 2021 Westport, New Zealand. We report on hazard, exposure and features observed 247 buildings. samples were applied evaluate univariable multivariable model performance using different variable sample sizes regression-based supervised learning algorithms. Feature analysis...
Abstract This study delivers a spatiotemporal economic risk evaluation of New Zealand’s road network to extreme sea-level driven flooding and relative sea level (RSL) change from 2020 2120. A spatial analysis framework was developed calculate direct monetary loss as the expected exceedance probability (EPL) average annual (AAL) at component level. These metrics were estimated national regional levels between 2120 using RSL projections for medium confidence Shared Socio-economic Pathways...
ABSTRACT Flood impact assessment is limited by a scarcity of damage curves for critical infrastructure network components. This study presents judgement‐based methodology developing component flood curves. The 12 semi‐structured workshops record responses estimated minimum and maximum ratios at 0.5, 1, 2 3 m water depths. 46 responses, weighted participant expertise level, are aggregated into discrete curve each component. Damage presented 34 components across the transportation, energy,...
Flood damage assessments provide critical information for flood hazard mitigation under changing climate conditions. Recent efforts to improve and systemise have focused primarily on urban environments with few examples primary industries such as dairy. This paper explores the adverse consequences of flooding dairy farms in Bay Plenty region, New Zealand. Ex-tropical Cyclone Debbie April 2017 caused prolonged riverine surface water over 3500 hectares farmland. The event provided an...
This study investigates the direct and indirect impacts of extreme sea level (ESL) flooding on critical infrastructure. While methods to quantify ESL coastal areas are well established, that extend beyond directly affected population less understood. assesses vulnerability electricity, road, telecommunication, water supply, wastewater infrastructure service disruption from in South Dunedin, New Zealand. We quantified by single multiple losses caused 100-year average recurrence interval (ARI)...
Abstract. Transportation infrastructure is crucial to the operation of society, particularly during post-event response and recovery. assets, such as roads bridges, can be exposed tsunami impacts when near coast. Using fragility functions in an impact assessment identifies potential effects inform decisions on mitigation strategies. Such have not been available for transportation assets hazard past due limited empirical datasets. This study provides a suite observations influence inundation...
Abstract. Indonesia has experienced several tsunamis triggered by seismic and non-seismic (i.e., landslides) sources. These events damaged or destroyed coastal buildings infrastructure caused considerable loss of life. Based on the Global Earthquake Model (GEM) guidelines, this study assesses empirical tsunami fragility to inventory 2018 Sunda Strait, Sulawesi–Palu, 2004 Indian Ocean (Khao Lak–Phuket, Thailand) tsunamis. Fragility curves represent impact characteristics structural components...