Massey Documents by Type

Permanent URI for this communityhttps://mro.massey.ac.nz/handle/10179/294

Browse

Has files: YesSubject: search.filters.subject.Flood damage

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Integrated flood risk management for urban resilience: A multi-method framework combining hazard mapping, hydrodynamic modelling, and economic impact assessment
    (Elsevier B V on behalf of the College of Civil Engineering, Tongji University, 2025-09-01) Jayawardane P; Rajapakse L; Siriwardana C
    Flooding has become an emerging global catastrophe, generating considerable damage to both infrastructures and lives. Despite the critical need for quantitative assessments of both flood damage and the effectiveness of flood mitigation measures, most existing studies have focused on isolated aspects of flood risk. Only a very limited number of studies have comprehensively integrated hazard mapping, hydrodynamic simulations, and economic damage estimations to evaluate the real-world impact and effectiveness of flood mitigation measures (FMMs). This study presents a multi-method approach to evaluate the performance of such established structural FMMs. Initially, hazard assessments for two selected case study areas, the Colombo Metropolitan Area in Sri Lanka and Auckland, New Zealand, two flood-prone cities with contrasting geographical contexts. Flood inundation mapping for the Madiwela South Diversion, Colombo, Sri Lanka, was performed using hydrodynamic modeling to demonstrate the reduction in flood inundation area and depth after the implementation of the measure, considering six (6) design return periods (RPs). Subsequently, tangible and intangible property damage estimations for “without FMMs” and “with FMMs” were evaluated to identify the benefit of responding to flood conditions, utilising a vulnerability-based economic analysis. In addition to damage estimations, the study adopts a novel approach by conducting an investment viability analysis to find the Benefit-to-Cost ratios and Net Present Value of nine (9) selected FMMs implemented by Sri Lanka Land Development Co-operation (SLLDC). The FMMs implemented by SLLDC were selected from Colombo, Sri Lanka. The quantified damage estimates revealed a reduction in flood damages ranging from 39 % to 63 %, alongside a decrease in flood inundation depths between 9 % and 12 %, and the results underscore the significant effectiveness of FMMs in managing urban flooding and minimising its impacts. This cross-disciplinary methodology enables a transferable framework for resilience-oriented urban planning in diverse hydrological and geographical contexts.
  • Thumbnail Image
    Item
    Is Queenstown a sanctuary? : a retrospective study of the preparation, mitigation and recovery of the Queenstown community from the effects of the Queenstown flood and hazard slip events of 1999 : a thesis presented in partial fulfilment of the requirements for the degree of Master of Arts in Psychology at Massey University, Palmerston North, New Zealand
    (Massey University, 2002) Richardson, Vivien
    Using a salutogenic paradigm, the present study examined the factors that contributed to hardiness and resilience, in the Queenstown community, following the flood and slip events of November 1999. It was hypothesised that sense of community, coping style, self-efficacy, and social support would predict stress, as measured by the Hopkins Symptom Checklist-21 (HSCL). It was also hypothesised that unique environmental qualities of Queenstown, i.e. the lakes, mountains, small community and being a visitor destination, would make a significant contribution to participants sense of community. Hazard knowledge, preparation and mitigation, with particular reference to flood hazards was also examined Additionally, in depth interviews with a high intensity sample of participants, were also carried out. This qualitative information was intended to examine the strengths within the community that had helped the community to deal with the flood and slip events. Additionally, the interviews were used as a forum, for participants to raise their own issues, relating to these events. The hypothesis that the selected variables would predict resilience, was not supported, but support was found for the importance of the unique physical and environmental qualities of Queenstown to residents. The interview results provided support for the view that the Queenstown community was able to withstand the effects of the flood and slip events, with recovery of businesses and tourism being almost complete at four months post event. Though some of those properties affected by the event could never be restored, resulting in irreplaceable losses and changes to individuals' lives, the community showed remarkable strengths and had done much to address inadequacies highlighted by the events.