Integrating Ecological Flow Regimes and Environment Gradient Concept in Optimum Water Resources Management
Date Issued
2008
Date
2008
Author(s)
Wu, Tzu-Ching
Abstract
Investigation on environmental flow for conservation of river ecosystem has been focused on ecological flow regime approach which is more comprehensive than the traditional minimum flow management schemes that merely consider single flow value. The pivotal difficulty in developing ecological flow regime is how to take into account the interaction and relation between flow regime and river ecosystem. In this study we propose an idea of considering the relation between ecological flow regime and fish communities and then applying the gradient analysis technique in quantitative ecology theory to constructing the ecological response model. The model is built based on the fish abundance and the Taiwan Ecohydrology Indicator System (TEIS). The dummy variables for representing synthetic environment gradient could be used to identify the niche in each fish species on ecohydrological gradient axis. The main advantages of this technique are: (1)approximate the natural flow regimes that maintained the entire panoply of species, (2)based on unimodal Gaussian response model, and (3)separate the effects of explanatory environment variables. his technique is then extended herein to build the optimal operation model in Shihmen Reservoir by considering the maintenance of natural flow regimes and human needs, and the non-dominated sorting genetic algorithm II (NSGA-II) is used to optimize the multi-objective model. The results demonstrated that more meaningful manner of flow management in ecological aspect can be effectively constructed by integrating the gradient analysis technique and NSGA-II for the ecological flow regimes. Meanwhile, the method searches the optimal operation rule that can simultaneously the water demand for maintenance of ecosystem and human need provides the decision for multi-objective water resources management.
Subjects
Ecological flow regimes
Taiwan Ecohydrology Indicator System
The gradient analysis
Reservoir operation
Multi-objective Water Resources Management
NSGA-II
Type
thesis
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