River Architect

Schwindt, Sebastian; Larrieu, Kenneth G.; Pasternack, G. B.; Rabone, Geoff

doi:10.1016/j.softx.2020.100438

Cited by 4 publications

(6 citation statements)

References 35 publications

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“…River Architect uses univariate HSCs to produce univariate HSI rasters with values ranging from zero to one for each Q i . It then combines all the univariate HSI rasters into a single combined HSI (cHSI) raster for each Q i using either a geometric mean or product calculation (Schwindt et al, 2020) at the user's discretion.…”

Section: Novel Methodsmentioning

confidence: 99%

“…This work offers new basic and applied science contributions to ecology and ecohydraulics compared to pre‐existing ones on several fronts, including the use of graph theory to find optimal fish escape routes. Also, this algorithm has been made highly accessible for widespread use through incorporation into the free, open‐source River Architect software (Schwindt, Larrieu, Pasternack, & Rabone, 2020; https://riverarchitect.github.io/). Detailed explanation of the literature and new method sufficient for reader understanding precludes inclusion of an application and vetting; those elements are supplied in the subsequent companion article (Larrieu and Pasternack, submitted).…”

Section: Introductionmentioning

confidence: 99%

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Automated analysis of lateral river connectivity and fish stranding risks—Part 1: Review, theory and algorithm

2020

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Riverine fish stranding is of significant concern due to its potentially devastating impacts on fish populations already at risk. Because stranding is dependent on a wide range of biotic and abiotic factors, it is difficult to accurately identify and parameterize fish stranding risks for various river topographies, fish species/lifestages and flow ramping scenarios. This article presents a literature review, new concepts and a novel Python3 algorithm for post‐processing two‐dimensional hydrodynamic numerical model results to identify spatially explicit locations where fish stranding is likely, such as but not limited to downstream of hydropeaking facilities. Compared to previous stranding algorithms, this one is novel in its use of graph theory to find optimal fish escape routes and for its embedding in the free, open‐source river analysis software River Architect. Guided by biological parameter selection and supplied with two‐dimensional hydrodynamic model rasters, River Architect's Stranding Risk module is suitable for characterization of existing pool stranding risks, alternative flow regime and topographic design evaluation and post‐project assessment of rivers during flow recessions.

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Section: Novel Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Automated analysis of lateral river connectivity and fish stranding risks—Part 1: Review, theory and algorithm

2020

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“…The concepts detailed in the companion article are briefly summarized here and illustrated with a flowchart (Figure 1). The free, open‐source algorithm is implemented as part of River Architect (Schwindt et al, 2020; https://riverarchitect.github.io/).…”

Section: Fish Stranding Risk Algorithmmentioning

confidence: 99%

“…Problem acknowledgement has motivated mitigation, including by restoring, rehabilitating, or enhancing degraded riverine habitats. Such projects have yielded mixed results (Kauffman et al, 1997; Morandi et al, 2014; Palmer et al, 2010), necessitating significant improvements to river restoration project design (Brown et al, 2015; Brown & Pasternack, 2019) and preconstruction and postconstruction design evaluation (Brown & Pasternack, 2009; Schwindt et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Automated analysis of lateral river connectivity and fish stranding risks. Part 2: Juvenile Chinook salmon stranding at a river rehabilitation site

Larrieu

Pasternack

2021

Ecohydrology

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The dynamics of fish stranding have not been academically investigated within the context of physical adjustments to rivers for habitat enhancement purposes. River projects may aim to help fish populations but instead may function as attractive nuisances reducing populations because of unaccounted‐for stranding risk. This study applies a novel algorithm to predict spatially explicit, meter‐resolution fish stranding risk at a river rehabilitation site in California to address three scientific questions. Postproject disconnected wetted area predictions were validated against water surface elevation measurements and time lapse photography of flow reductions and stranding events. A comparison of preproject, final design, and postproject topographies revealed that the occurrence and severity of stranding events is highly sensitive to side‐channel topographic structure and postproject morphodynamic change. Even with moderate flows, side‐channel exits tend to close off by bars built across them via bedload transport. Implications for river management practices and river rehabilitation project design are discussed.

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“…Many river rehabilitation projects aim to re-establish natural pool-riffle sequences (Brown et al 2016, Lane et al 2018; however, there are disagreements in the literature on the morphodynamic processes that shape them, and resultantly, there is no widely adapted, standardized, systems approach for their design Pasternack 2019, Wade et al 2002). To increase river channel stability and quality of aquatic habitat, pool-riffle sequences are being artificially constructed, so considering form-process interactions during restoration projects is vital (Schwindt et al 2020).…”

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confidence: 99%

Hyporheic exchanges due to channel bed and width undulations

Movahedi

Dehghani

Schmidt

et al. 2021

Advances in Water Resources

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Riffle-pool sequences are fundamental, ubiquitous morphological features of alluvial rivers that are thoroughly studied in general and commonly incorporated into river restoration projects. Most previous investigations on the effect of riffle-pool sequences on hyporheic exchanges focused on solely bed undulation, because that is widely thought to be the defining feature of riffle-pool sequences. However, riffle-pool sequences also have significant width undulations that are vital to riffle-pool sequences morphodynamics, yet relatively few studies exist on the effect of such undulations on hyporheic exchanges.Thus, in this study based on laboratory experiments and numerical simulations, we investigate the effect of bed and width undulations on hyporheic zone characteristics for various ratio of width amplitude to bed amplitude. The variation of hyporheic exchange characteristics (i.e. hyporheic exchange flux and residence time) for different riffle-pool designs were also assessed by creating prescribed topography of synthetic river valleys. The results showed that due to pressure variation along width undulations, the upwelling and downwelling patterns can also be observed for only width undulations in rivers, in the absence of bed undulations, and as width undulation amplitude decreases, the normalized hyporheic exchanges (Q*HZ) increase and normalized median residence time (RT*) decreases. Also, simultaneous channel bed and width undulations result in higher Q*HZ especially when a pool is located in an expansion (aka "oversized" crosssection) and a riffle in a constriction ("nozzle"). Our results suggest that river restoration project that artificially construct wide pools and constricted riffles will achieve maximum Q*HZ and RT*, though they will not be geomorphically self-sustainable.

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River Architect

Cited by 4 publications

References 35 publications

Automated analysis of lateral river connectivity and fish stranding risks—Part 1: Review, theory and algorithm

Automated analysis of lateral river connectivity and fish stranding risks—Part 1: Review, theory and algorithm

Automated analysis of lateral river connectivity and fish stranding risks. Part 2: Juvenile Chinook salmon stranding at a river rehabilitation site

Hyporheic exchanges due to channel bed and width undulations

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