Development of eco‐hydraulic model for assessing fish habitat and population status in freshwater ecosystems

Yao, Weiwei; Bui, Minh Duc; Rutschmann, Peter

doi:10.1002/eco.1961

Cited by 21 publications

(9 citation statements)

References 64 publications

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“…Although, evaluating the river restoration strategies also rely on both the pre and post-monitoring data, this data of the Chin-sha River at current stage has hampered progress in practical understanding of the physical processes. However, as numerical modelling has successful improved the river restorations (Zhang et al, 2016(Zhang et al, , 2016aYao et al, 2018), the overall accuracy and performance of our numerical model gives confidence in the numerical model.…”

Section: Comparison Of Restoration Schemessupporting

confidence: 52%

A numerical model for river habitat restoration: a case study of the Chin-sha River in China

2019

Global NEST: The International Journal

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<p>Currently, the ecosystem is being damaged in many rivers and subsequently the fish species living there are also facing decline or even extinction. This situation urges to model the habitat and to design suitable restoration strategies in order to increase the capabilities of ecological modeling. In this paper, we proposed a numerical model to assess the ecosystem habitat situation and investigated the impacts of two ecological restorations strategies for the target fish species. The model includes a hydrodynamic model, a habitat model and habitat restoration schemes. The hydrodynamic model simulated the flow properties while sediments in the riverbed were also surveyed. Based on these parameters and fish preference curves, the habitat suitability indices were calculated. In order to analyze the river habitat quality, the weighted usable areas and overall suitability index were also calculated and the effects of the restoration strategies on selected fish species (Freshwater Reeves shad - Tenualosa reevesii) in the Chin-sha River were evaluated. The two ecological restoration strategies: addition of side-channel (scheme I) and river bank reconstruction (scheme II) enhanced the Freshwater Reeves shad habitat suitability level, with the high suitability index proportion increasing from 19.5% to 33.1% for scheme I and to 36.1% for scheme II. Based on the modelling results, we concluded that our numerical model could potentially provide suitable scenarios for successful fish habitat restoration.</p>

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Section: Comparison Of Restoration Schemessupporting

confidence: 52%

A numerical model for river habitat restoration: a case study of the Chin-sha River in China

2019

Global NEST: The International Journal

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“…Two population models were used, including a logistic population model and a matrix population model (Yao, 2016; Yao et al, 2018; Yao & Chen, 2018). The logistic population model is as follows:

P_{t + normalΔ t}^{F} goodbreak= \frac{β \times {WUA}_{t + normalΔ t}^{F} \times P_{t}^{F} \times e^{α \times ()(, {OSI}_{t + normalΔ t}^{F} goodbreak- {OSI}_{t}^{F})}}{β \times {WUA}_{t + normalΔ t}^{F} + P_{t}^{F} \times ()(, e^{α \times ()(, {OSI}_{t + normalΔ t}^{F} goodbreak- {OSI}_{t}^{F})} goodbreak- 1)},

where

P_{t}^{F}

and

P_{t + normalΔ t}^{F}

are population numbers at time t and t + Δ t for fish species F; α and β are model empirical parameters chosen as described by Yao (2016) ( α is 5 and 8 for S.P.…”

Section: Methodsmentioning

confidence: 99%

Stocking to offset negative effects of dam construction and balance the ecosystem

Yao

2023

Fisheries Management Eco

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An ecohydraulic model system was developed to evaluate the effects of the Da‐Wei dam construction and possible fish restoration strategies. The ecohydraulic model system consists of a hydrodynamic model, a hydromorphology model, a habitat model, and the logistic and matrix population models. The effects of dam construction and fish stocking strategy on fish habitat and population status were studied in the Jiao‐Mu River, providing the modeled ecological status of Schizothorax prenanti and Schizothorax plagiostomus heckel populations within the river segment. The two fish species richness, fish age structures, and fish density distributions were predicted. Based on the fish number prediction, the optimal number of fish to stock was evaluated with the population models, and an optimal fish stocking proposition was worked out. The results indicated that the two fish species habitat quality and fish richness would decrease due to the hydropower dam construction, and the fish stocking strategy could make up the fish species ecological status. The findings could facilitate the quantity and quality assessment of a dam development plan and increase the success rate of fish restoration.

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“…This metric is calculated as the product of habitat area (i.e., cell size) and habitat suitability summed across a study domain (Bovee, 1986). Some studies have also nondimensionalized this index by dividing it by the area of the study domain (Benjankar et al, 2018;Mouton et al, 2007;Yao, Bui, & Rutschmann, 2018). Despite its widespread use, the WUA index has been highly criticized for lacking statistical certainty (Williams, 1996), interpretability (Mather, Bason, Purdy, & Silver, and biological meaning (Railsback, 2016).…”

Section: Changes In Physical Habitat Conditions Associated With Lost Sustained and Gained Microhabitatmentioning

confidence: 99%

Chinook salmon rearing habitat–discharge relationships change as a result of morphodynamic processes

Moniz

Pasternack

2021

River Research & Apps

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Relationships between fluvial aquatic habitat availability and discharge are often assumed to remain static when used with hydrologic datasets to analyze changes in habitat availability over time. Despite this assumption, studies have observed significant changes in aquatic habitat availability before and after restoration projects, dam removals, and extreme flood events. However, research is lacking on how aquatic habitat changes as a result of morphodynamic processes during more commonly occurring hydrologic conditions. This study compared Chinook salmon (Oncorhynchus tshawytscha) rearing habitat availability at 19 discharges before and after a relatively mild 8-year hydrologic period punctuated with modest floods on the lower Yuba River in California, USA. During this time, the total area of rearing habitat remained relatively consistent at discharges <2Â bankfull but decreased by up to 25% at discharges >2Â bankfull. Significant decreases in rearing habitat area appeared to be the result of widespread erosion on floodplains, terraces, and lateral bars, even after only modest floods. As a result, spatially delineated areas of lost habitat tended to increase in water depth and velocity at baseflow, bankfull, and floodplain-filling discharges, while areas of gained habitat decreased in depth and velocity. Although these specific results may not apply to all rivers around the world, the finding that habitat-discharge relationships change as a result of morphodynamic processes likely does transfer globally and should be considered when making long-term regulatory and management decisions, such as instream flow requirements and habitat restoration plans.

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Development of eco‐hydraulic model for assessing fish habitat and population status in freshwater ecosystems

Cited by 21 publications

References 64 publications

A numerical model for river habitat restoration: a case study of the Chin-sha River in China

A numerical model for river habitat restoration: a case study of the Chin-sha River in China

Stocking to offset negative effects of dam construction and balance the ecosystem

Chinook salmon rearing habitat–discharge relationships change as a result of morphodynamic processes

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