Compromise Programming Methodology for Determining Instream Flow Under Multiobjective Water Allocation Criteria

Shiau, Jenq Tzong; Wu, Fu Chun

doi:10.1111/j.1752-1688.2006.tb05605.x

Cited by 73 publications

(44 citation statements)

References 27 publications

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“…Shiau and Wu (2004b) presented a discreet three-class system for evaluating overall hydrologic alteration based on the number of IHA classified in each alteration category. Shiau and Wu (2006) later proposed a modified approach to combining individual values of D i as a single index of overall hydrologic alteration. In the modified system, if all IHA are classified as lowly altered (i.e., D i < 33%), then the overall degree of hydrologic alteration, D T , is given by…”

Section: Overall Degree Of Hydrologic Alterationmentioning

confidence: 99%

“…The second step is to search the solution of Equation (9). Shiau and Wu (2006) have used the CP to seek the optimal constant release scheme. However, applying the CP to search the optimal time-varying schemes would be extremely time-consuming since numerous combinations of flows must be tried in the first step.…”

Section: Compromise Programming (Cp)mentioning

confidence: 99%

“…Currently a constant flow of 9.5 m 3 s À1 is released for the instream needs, which approximately equals to the 95th-percentile daily flow (Water Conservancy Agency, 2000). Such limited amount of water release is, however, unable to create sufficient variations for retaining the ecosystem integrity (Shiau and Wu, 2006). Recognizing the importance of natural flow variations, the optimal operation of the Kaoping diversion weir seeks to meet the agricultural water needs, projected municipal water demands, and targeted flow variability.…”

Section: Introductionmentioning

confidence: 99%

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A dynamic corridor‐searching algorithm to seek time‐varying instream flow releases for optimal weir operation: comparing three indices of overall hydrologic alteration

Shiau

2007

River Research & Apps

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A full range of natural flow regime has been widely recognized as a primary driving force for sustaining the integrity of a riverine ecosystem. Existing instream flow methods strive to assure a constant minimum flow but not the natural flow variability. We present in this paper a dynamic corridor-searching algorithm to seek the optimal time-varying scheme for instream flow releases. A compromise programming (CP) is employed to search the optimal solution of an objective function aggregating the ecosystem and human needs objectives. The ecosystem need objective is represented by an overall index of hydrologic alteration, which integrates 32 indicators of hydrologic alteration (IHA) derived from the range of variability approach (RVA). The human need objectives are expressed by shortage ratios for the agricultural and municipal water supplies. The proposed method is applied to a weir operation in Taiwan. Three approaches to evaluating the overall degree of hydrologic alteration (i.e., the three-class, fuzzy-based, and overall-mean approaches) are compared here. The results show that the time-varying schemes improve the human need objective, but only slightly deteriorate the ecosystem need objective. Such advantages increase with the time-varying frequency. For the wet periods, smaller flow releases may be prescribed; for the dry periods, however, greater releases must be specified to secure a lower degree of overall hydrologic alteration. It is also revealed that use of the three-class approach to evaluate the overall hydrologic alteration facilitates to eliminate highly altered IHA and maintain those low-flow characteristics subtle to flow diversions. However, such outcomes are achieved at the cost of greater deficits for human water demands. Copyright # 2007 John Wiley & Sons, Ltd.

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Section: Overall Degree Of Hydrologic Alterationmentioning

confidence: 99%

Section: Compromise Programming (Cp)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A dynamic corridor‐searching algorithm to seek time‐varying instream flow releases for optimal weir operation: comparing three indices of overall hydrologic alteration

Shiau

2007

River Research & Apps

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“…Most of the previous studies considered ecological flow needs by incorporating a hard constraint of a constant minimum flow rate (Homa et al, 2005). However such treatment has encountered serious argument, because in-stream flow requirements are far more complex than a fixed aquatic base flow requirement (Shiau and Wu, 2006;Smith et al, 2007).…”

Section: Ecological Constraintsmentioning

confidence: 99%

“…However, the major function of the JP cascaded reservoirs is hydropower production. The release of ecological flow unavoidably leads to a loss of hydropower generation (Shiau and Wu, 2006;Chen et al, 2009). Therefore, the target of ecologically-friendly operation of the JP cascaded reservoirs is, to quantify the loss of power generation, and to find an optimal scheme that largely satisfies the ecological flow requirement while minimizing the loss of hydropower production.…”

Section: Introductionmentioning

confidence: 99%

Ecologically-friendly operation scheme for the Jinping cascaded reservoirs in the Yalongjiang River, China

Duan

Chen

et al. 2013

Front. Earth Sci.

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Ecologically-friendly reservoir operation procedures aim to conserve key ecosystem properties in the rivers, while minimizing the sacrifice of socioeconomic interests. This study focused on the Jinping cascaded reservoirs as a case study. An optimization model was developed to explore a balance between the ecological flow requirement (EFR) of a target fish species (Schizothorax chongi) in the dewatered natural channel section, and annual power production. The EFR for the channel was determined by the Tennant method and a fish habitat model, respectively. The optimization model was solved by using an adaptive real-coded genetic algorithm. Several operation scenarios corresponding to the ecological flow series were evaluated using the optimization model. Through comparisons, an optimal operational scheme, which combines relatively low power production loss with a preferred ecological flow regime in the dewatered channel, is proposed for the cascaded reservoirs. Under the recommended scheme, the discharge into the Dahewan river reach in the dry season ranges from 36 to 50 m 3 /s. This will enable at least 50% of the target fish habitats in the channel to be conserved, at a cost of only 2.5% annual power production loss. The study demonstrates that the use of EFRs is an efficient approach to the optimization of reservoir operation in an ecologically friendly way. Similar modeling, for other important fish species and ecosystem functions, supplemented by field validation of results, is needed in order to secure the long-term conservation of the affected river ecosystem.

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Assessment of flow regime alterations over a spectrum of temporal scales using wavelet‐based approaches

Chang

Shiau

2015

Water Resources Research

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The full range of natural flow regime is essential for sustaining the riverine ecosystems and biodiversity, yet there are still limited tools available for assessment of flow regime alterations over a spectrum of temporal scales. Wavelet analysis has proven useful for detecting hydrologic alterations at multiple scales via the wavelet power spectrum (WPS) series. The existing approach based on the global WPS (GWPS) ratio tends to be dominated by the rare high-power flows so that alterations of the more frequent low-power flows are often underrepresented. We devise a new approach based on individual deviations between WPS (DWPS) that are root-mean-squared to yield the global DWPS (GDWPS). We test these two approaches on the three reaches of the Feitsui Reservoir system (Taiwan) that are subjected to different classes of anthropogenic interventions. The GDWPS reveal unique features that are not detected with the GWPS ratios. We also segregate the effects of individual subflow components on the overall flow regime alterations using the subflow GDWPS. The results show that the daily hydropeaking waves below the reservoir not only intensified the flow oscillations at daily scale but most significantly eliminated subweekly flow variability. Alterations of flow regime were most severe below the diversion weir, where the residual hydropeaking resulted in a maximum impact at daily scale while the postdiversion null flows led to large hydrologic alterations over submonthly scales. The smallest impacts below the confluence reveal that the hydrologic alterations at scales longer than 2 days were substantially mitigated with the joining of the unregulated tributary flows, whereas the daily-scale hydrologic alteration was retained because of the hydropeaking inherited from the reservoir releases. The proposed DWPS approach unravels for the first time the details of flow regime alterations at these intermediate scales that are overridden by the low-frequency high-power flows when the long-term averaged GWPS are used.

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Compromise Programming Methodology for Determining Instream Flow Under Multiobjective Water Allocation Criteria

Cited by 73 publications

References 27 publications

A dynamic corridor‐searching algorithm to seek time‐varying instream flow releases for optimal weir operation: comparing three indices of overall hydrologic alteration

A dynamic corridor‐searching algorithm to seek time‐varying instream flow releases for optimal weir operation: comparing three indices of overall hydrologic alteration

Ecologically-friendly operation scheme for the Jinping cascaded reservoirs in the Yalongjiang River, China

Assessment of flow regime alterations over a spectrum of temporal scales using wavelet‐based approaches

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