Computational River Dynamics

Wu, Weiming

doi:10.4324/9780203938485

Cited by 309 publications

(374 citation statements)

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“…These 1-D channel routing models are more efficient and have lower data requirements than the 2-D and 3-D hydraulic models used in local-scale studies [Wu, 2008], and 1-D routing models are thus more suitable for use in global land models. In contrast to other hydrologic processes where developments in the hydrologic sciences have immediate applicability in land models, the global-scale applicability of complex…”

Section: A5 Channel/floodplain Routingmentioning

confidence: 99%

Improving the representation of hydrologic processes in Earth System Models

Clark

Fan

Lawrence

et al. 2015

Water Resources Research

468

404

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Many of the scientific and societal challenges in understanding and preparing for global environmental change rest upon our ability to understand and predict the water cycle change at large river basin, continent, and global scales. However, current large-scale land models (as a component of Earth System Models, or ESMs) do not yet reflect the best hydrologic process understanding or utilize the large amount of hydrologic observations for model testing. This paper discusses the opportunities and key challenges to improve hydrologic process representations and benchmarking in ESM land models, suggesting that (1) land model development can benefit from recent advances in hydrology, both through incorporating key processes (e.g., groundwater-surface water interactions) and new approaches to describe multiscale spatial variability and hydrologic connectivity; (2) accelerating model advances requires comprehensive hydrologic benchmarking in order to systematically evaluate competing alternatives, understand model weaknesses, and prioritize model development needs, and (3) stronger collaboration is needed between the hydrology and ESM modeling communities, both through greater engagement of hydrologists in ESM land model development, and through rigorous evaluation of ESM hydrology performance in research watersheds or Critical Zone Observatories. Such coordinated efforts in advancing hydrology in ESMs have the potential to substantially impact energy, carbon, and nutrient cycle prediction capabilities through the fundamental role hydrologic processes play in regulating these cycles.

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Section: A5 Channel/floodplain Routingmentioning

confidence: 99%

Improving the representation of hydrologic processes in Earth System Models

Clark

Fan

Lawrence

et al. 2015

Water Resources Research

468

404

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“…równanie Exnera [Parker 2004, Wu 2007, Brunner 2010]. Jest to równanie róż-niczkowe cząstkowe będące matematycznym zapisem zasady zachowania masy transportowanego rumowiska.…”

Section: Metodykaunclassified

“…W pobliżu budowli wodnych może nastąpić naruszenie stateczności całej konstrukcji, a zmiana położenia linii brzegowej utrudnia pobór wody na cele gospodarcze czy też komunalne [Bednarczyk i Duszyński 2008]. Należy także pamiętać, iż transportowany materiał rzeczny niesie ze sobą duże ilości zanieczyszczeń [Wu 2007]. Ma to ogromny wpływ na ekosystemy nie tylko w dolnym i środ-kowym biegu rzeki, ale także przy ujściu [Wang i Andutta 2013].…”

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Analysis of Potential Intensity of Sediment Transport on Selected Reach of the Ner River

Szałkiewicz¹,

Dysarz²,

Wicher-Dysarz³

2015

Inż. Ekolog.

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STRESZCZENIECelem niniejszej pracy było wykonanie analiz symulacji transportu rumowiska dla wybranego odcinka rzeki Ner, z jednoczesnym wykorzystaniem narzędzi GIS. Praca została wykonana na przekrojach z 2012 roku wykonanych na potrzeby ISOK (Informatyczny System Ochrony Kraju). Przy pomocy programu ArcGIS został przygotowany numeryczny model koryta i doliny cieku, natomiast symulacje ruchu ustalonego i transportu rumowiska dla 5 okresów dziesięcioletnich przeprowadzono w programie HEC-RAS 5.0 Beta. Po przeprowadzeniu obliczeń zaktualizowana geometria koryta została utworzona za pomocą narzędzi RAS Mapper i ponownie zostało wygenerowane nowe koryto po symulacjach. ArcGIS został wykorzystany powtórnie podczas opracowywania wyników i posłużył do wygenerowania nowych rzędnych dna w stanie początkowym i końcowym. Różnica między nimi zobrazowała wielkość zachodzącej erozji i akumulacji. Proces erozji zaszedł w 13 przekrojach na analizowanym odcinku (średnia różnica rzędnych ujemna), natomiast akumulację zaobserwowano w 53 przekrojach. Maksymalna wartość spłycenia dna wyniosła 1,24 m w przekroju w km 18+868, natomiast największe pogłębienie wystąpiło w km 8+654 i wyniosło -0,76 m. Wszystkie wartości ponownie zostały naniesione na mapę topograficzną dla lepszego zobrazowania uzyskanych wyników.Słowa kluczowe: transport rumowiska, rzeka Ner, modelowanie procesów rzecznych, zastosowanie GIS w hydrologii. ANALYSIS OF POTENTIAL INTENSITY OF SEDIMENT TRANSPORT ON SELECTED REACH OF THE NER RIVER ABSTRACTThe aim of this study was to perform a simulation of sediment transport for the section of the river Ner, while also utilizing GIS tools. Using the ArcGIS numerical model of channel and stream valleys were developed, and motion simulations and sediment transport set for 5 ten-year periods were performed in HEC-RAS. Updated geometries after the simulations were created using the tools of RAS Mapper. ArcGIS was used again for analysing the results. It was used to generate ordinates of bottom in the initial state and final. The difference between them illustrated the magnitude of erosion and accumulation. The process of erosion occurred in 13 sections of the analysed model (the standard differential ordinates negative), while the accumulation in 53 sections. The maximum value of shallowing bottom was 1.24 m (cross-section at km 18 + 868), while the largest deepening occurred at km 8 + 654 (-0.76 m). All values, using ArcGIS, were marked on othophotomap.

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“…However, a number of researchers have found that a metric resolution is needed to reasonably approximate hydraulic habitat, i.e., local depth and velocity, which is relevant to river ecology and morphology (Crowder and Diplas, 2000;Cook and Merwade, 2009;Clifford et al, 2010;Williams et al, 2013;Abu-Aly et al, 2014). Furthermore, with the aid of analytical models for the vertical velocity distribution including a characterization of bed roughness, metric-resolution 2D models can reconstruct a 3D characterization of flow for a wide range of applications at far less computational expense than 3D models based on the Navier-Stokes equations (Begnudelli et al, 2010;Abu-Aly et al, 2014;Wyrick et al, 2014), although there are many examples of 3D flow phenomena that demand 3D models for an accurate description such as horseshoe vortices around bridge piers and similarly complex turbulent velocity fluctuations occurring around boulders, large bed forms, and other types of flow obstructions (Wu, 2007;Javernick et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Metric-Resolution 2D River Modeling at the Macroscale: Computational Methods and Applications in a Braided River

2015

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Metric resolution digital terrain models (DTMs) of rivers now make it possible for multi-dimensional fluid mechanics models to be applied to characterize flow at fine scales that are relevant to studies of river hydraulic geometry (HG) and ecological habitat, or microscales. These developments are important for managing rivers because of the potential to better understand system dynamics, anthropogenic impacts, and the consequences of proposed interventions. However, the data volumes and computational demands of microscale river modeling have largely constrained applications to small multiples of the channel width, or the mesoscale. This report presents computational methods to extend a microscale river model beyond the mesoscale to the macroscale, defined as large multiples of the channel width. A method of automated unstructured grid generation is presented that automatically clusters fine resolution cells in areas of curvature (e.g., channel banks), and places relatively coarse cells in areas lacking topographic variability. This overcomes the need to manually generate breaklines to constrain the grid, which is painstaking at the mesoscale and virtually impossible at the macroscale. The method is applied to a braided river (BR) and shown to yield an efficient fine resolution model. The sensitivity of model output to grid design and resistance parameters is also examined based on analysis of hydrology, HG, and river hydraulic habitats and the findings reiterate the importance of model calibration and validation.

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Computational River Dynamics

Cited by 309 publications

References 0 publications

Improving the representation of hydrologic processes in Earth System Models

Improving the representation of hydrologic processes in Earth System Models

Analysis of Potential Intensity of Sediment Transport on Selected Reach of the Ner River

Metric-Resolution 2D River Modeling at the Macroscale: Computational Methods and Applications in a Braided River

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