This research aims to build upon my previous participatory practice and research findings on the reshaping of urban waterfront spaces in Taichung City, Taiwan. It seeks to further explore the processes, mechanisms, and impacts of professional power transformation in waterfront governance. Previous research has identified the phenomenon of the "art field" gradually replacing the "hydraulic engineering field," as well as how design mediums have formed new power transitions within the hydraulic engineering field. However, the specific mechanisms of this professional power transformation, the interaction patterns between different professional groups, and the impact on waterfront governance performance require more systematic analysis. This study will employ a Mixed Methods Research approach, combining qualitative and quantitative methods to investigate the phenomenon of professional power transformation in depth. Mixed methods research is a methodological strategy that integrates different research paradigms and, through the principle of triangulation, understands complex social phenomena from multiple perspectives. Specifically, the research design includes: (1) Quantitative component: a structured questionnaire survey of 50 professionals from fields including hydraulic and environmental engineering, landscape design, environmental ecology, government planning and decision-making, community participation, and academic critique, to assess changes in professional influence, institutional mechanisms, and governance effectiveness; (2) Qualitative component: in-depth interviews with 30 key informants, supplemented by participatory observation and textual analysis, to explore the deeper mechanisms of professional interaction patterns, discourse power competition, and value orientation shifts. The research will adopt a concurrent design, collecting qualitative and quantitative data simultaneously, and then integrating the analysis results to obtain complementary understanding. The research will particularly focus on the interactive relationships among three professional domains: hydraulic or environmental engineering, landscape design, and ecologist, exploring: (1) the dynamic process of professional power redistribution; (2) the co-evolution of institutional spaces and professional discourses; (3) adaptation strategies of different professional groups; and (4) the impact of professional transformation on waterfront governance effectiveness. The research will use NVivo software for qualitative data coding, SPSS for quantitative analysis, and will integrate and establish dialogue between findings from both methods. Expected research outcomes include: constructing a theoretical model of "professional power transformation in waterfront governance," revealing the phased process and key mechanisms of professional field reconstruction; comparing waterfront governance cases from different cities to extract best practices; and proposing practical recommendations for promoting inter-professional collaboration and optimizing governance models. The research results will contribute to understanding professional dynamics in environmental governance and provide theoretical foundations and practical guidance for constructing more sustainable and integrated frameworks for waterfront governance.