Sizing an Off-stream Reservoir with Respect to Water Availability,Water Quality,and Biological Integrity |
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Authors: | Ni-Bin Chang Ho-Wen Chen Shu-Kuang Ning Hsin-Yi Hsu Kwang-Tsao Shao Tsu-Chang Hung |
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Institution: | (1) Department of Civil and Environmental Engineering, University of Central Florida, Orlando, FL 32816, USA;(2) Department of Environmental Engineering and Management, Chaoyang University of Technology, Changhua, Taiwan;(3) Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung, Taiwan;(4) Tainan Science Park, Tainan, Taiwan;(5) Institute of Zoology, Academia Sinica, Taipei, Taiwan;(6) Institute of Chemistry, Academia Sinica, Taipei, Taiwan |
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Abstract: | Sizing a new reservoir is a challenging task, which normally requires simultaneously a cost-effective, risk-informed, and
forward-looking decision analysis with respect to basin-wide hydrological features, environmental quality, and biological
integrity. Such a sustainable planning approach takes into account the global trend to balance the needs of economic growth,
ecological conservation, and environmental protection. To achieve the goal of sustainability, emphasis in this paper was placed
upon the correlation of three physical, chemical, and biological indices, including the dissolved oxygen (DO), the 5-day biochemical
oxygen demand (BOD5), and the index of biotic integrity (IBI), for the optimal planning of a reservoir in a river basin. This new methodological
paradigm has been employed for sizing an off-stream reservoir in the Hou-Lung River Basin, central Taiwan. The internal linkage
between the water quality parameters (DO and BOD5) and the IBI levels further enables us to formulate a special biotic integrity constraint which reflects fish community attributes
to suit a relatively low-density and unspecialized freshwater fish fauna in response to the changing water quality conditions
in the river basin. The tradeoffs among economic, environmental, and ecological aspects for reservoir sizing can then be based
on the river flow patterns, the water demand, the water quality standards, and the anticipated biological integrity in some
critical river reaches. Findings in a preliminary case study suggest that an optimal pumping scheme may be smoothly maintained
on a yearly basis within a combined multicriteria and multiobjective decision-making process. |
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