This paper uses a holistic approach within a catchment scale, through the application of both climatic and non-climatic parameters, to analyze the impacts of river floods on the human security needs of rural riverine communities in the Waimanu Catchment situated in Nausori, Fiji. Consideration of both climatic and non-climatic factors is required since non-climatic factors could be controlled to build resilience against floods. The indicator-based flood vulnerability index methodology is applicable worldwide, but the indicators used in this study were specifically related to the Pacific Island context. In the context of fluvial flood vulnerability, effects of land management and climate change are not mutually exclusive of each other. Consequently, vulnerability assessments should consider the connection between people’s actions and ecosystems for the entire catchment area since upstream land use practices influence flood vulnerabilities downstream. In our research, a community-based flood vulnerability index system in conjunction with rainfall variability and land use assessments was used to quantitatively and qualitatively analyze the flood vulnerability, and it was found that increased rainfall, poor agricultural practices, gravel extraction, and improper waste management predominantly increased the exposure and sensitivity of midstream and downstream communities to river floods by modifying river morphology. Midstream communities in the Waimanu Catchment were most vulnerable to river floods due to their very low adaptive capacity in terms of poor ecosystem health and lack of natural resources to cope with the subsequent impacts of floods, being most sensitive to changes in land use and land cover.

本文在流域范围内使用整体方法，通过应用气候和非气候参数来分析河流洪水对斐济 Nausori 的 Waimanu 流域农村沿河社区人类安全需求的影响。需要同时考虑气候和非气候因素，因为可以控制非气候因素来建立抵御洪水的能力。基于指标的洪水脆弱性指数方法适用于全球，但本研究中使用的指标与太平洋岛屿环境具体相关。在河流洪水脆弱性的背景下，土地管理和气候变化的影响并不相互排斥。最后，脆弱性评估应考虑整个集水区的人类活动与生态系统之间的联系，因为上游土地利用实践会影响下游的洪水脆弱性。在我们的研究中，基于社区的洪水脆弱性指数系统结合降雨变化和土地利用评估被用于定量和定性地分析洪水脆弱性，发现降雨增加、农业实践不当、砾石开采和不当浪费管理主要通过改变河流形态来增加中游和下游社区对河流洪水的暴露度和敏感性。