A Research of Flood Reduction Strategy in Taichung City based on Landscape Characteristic of Green Infrastructure

Abstract

Amid climate change and sprawling of impervious cement surface urban area encounters severe challenges from increasing run-off and frequency of floods around the world This research interests in the contribution of Green Infrastructure (GI) to flood reduction Literature pointed out that taking advantage of GI to increase vegetation and to reduce flood planners should consider the landscape characteristic of GI Therefore this research assesses the effectiveness to mitigate flood with different landscape characteristics of urban GI such as parks schools squares in terms of the size shape and location of GI which are quantitatively calculated with Landscape Metrics (LMs) in this research The research approach in this study is Simulation Approach The flood is simulated by Physiographic Drainage-Inundation Model (PDIM) which is developed based on the inundation theory presented by Cunge (1975) (Shiau 2012) and programmed by Professor Chang-Tai Tsai in National Cheng Kung University and the flood simulation is run under different GI distribution The relationship between GI distribution and flood is examined in an empirical case study based on the initial result of the simulation and the LMs of GI New simulation results in the empirical study are further analyzed with Local Spatial Autocorrelation (including Univariate Local Spatial Autocorrelation and Bivariate Local Spatial Autocorrelation) and Narrative statistics which are the research methods in this research This research designates GI at H_L (flood height high but GI LMs low) cell which does engender generous flood reduction in macro simulation and the GI strategy achieves the highest effect and clustering phenomenon in SA (flood height high but GI Area LMs low) Finally this research samples 8 cells from SA to observe micro hydrology around these cells Flow direction and hydrology graph show that the influence of strategy implementation to every target cell and its surrounding cells differs in extent and location which signifies the dynamic feature of flood and provides planners a more concrete reference in the respective of comprehensive environment characteristics The result of this research is not a discipline for planners to plan GI for all urban area but the process is applicable in various urban areas Therefore this research is more like a test of a framework for GI locating planning with the exploring of influence from GI strategy with the consideration of landscape characteristic of GI

Date of Award	2020
Original language	English
Supervisor	Han-Liang Lin (Supervisor)