Hydrological-Morphometric Characteristics of Danube Delta Branches in the Backwater Zone

Михайлова, М. В.; Isupova, M. V.; Морозов, В. Н.

doi:10.1134/s0097807820030112

Cited by 11 publications

(14 citation statements)

References 1 publication

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“…In order to focus on the effect of tides on channel width divergence, we estimated the single distributary channel width as the sum of all distributary channel widths multiplied by n −0.5 , such that

w_{m} = n^{- \frac{1}{2}} \sum_{i = 1}^{n} w_{i}

, where n is the number of distributary channels. We estimated the upstream channel depth d u following hydraulic geometry rules based on the mean annual discharge (Mikhailov, ).…”

Section: Testing the Predictionmentioning

confidence: 99%

“…Over longer timescales (decades to centuries) delta morphology will adjust, and analyses such as the one presented here can help to estimate potential changes. Assuming discharge will remain negligible in the Colorado River, the upstream channel depth and width will decrease to a new equilibrium that can be estimated using well‐established hydraulic geometry relationships (Mikhailov, ). We estimate that the upstream adjustment of the Colorado will trigger estuary infilling that leads to a sevenfold decrease in the tidal prism, and an ~2 km narrowing of the river mouth due to deposition (Figure b).…”

Section: Application To Changing Deltasmentioning

confidence: 99%

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Future Change to Tide‐Influenced Deltas

Nienhuis

Hoitink

Törnqvist

2018

Geophysical Research Letters

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Tides tend to widen deltaic channels and shape delta morphology. Here we present a predictive approach to assess a priori the effect of fluvial discharge and tides on deltaic channels. We show that downstream channel widening can be quantified by the ratio of the tide-driven discharge and the fluvial discharge, along with a second metric representing flow velocities. A test of our new theory on a selection of 72 deltas globally shows good correspondence to a wide range of environments, including wave-dominated deltas, river-dominated deltas, and alluvial estuaries. By quantitatively relating tides and fluvial discharge to delta morphology, we offer a first-order prediction of deltaic change that may be expected from altered delta hydrology. For example, we expect that reduced fluvial discharge in response to dam construction will lead to increased tidal intrusion followed by enhanced tide-driven sediment import into deltas, with implications for navigation and other human needs.Plain Language Summary Due to global-scale construction of reservoirs and direct water withdrawal for irrigation, river discharge peaks that feed deltas are in many cases diminishing. Here we introduce a simple theory to estimate the response of tide-influenced deltas to river discharge change. First, we show that our theory successfully predicts the magnitude of downstream channel widening, a hallmark of tide-dominated deltas. Reduced river discharge leads to import of sediment by tides, reducing the water volume within a delta. Our work can help predict long-term delta change and inform engineering and restoration projects to enhance delta resilience.

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w_{m} = n^{- \frac{1}{2}} \sum_{i = 1}^{n} w_{i}

, where n is the number of distributary channels. We estimated the upstream channel depth d u following hydraulic geometry rules based on the mean annual discharge (Mikhailov, ).…”

Section: Testing the Predictionmentioning

confidence: 99%

Section: Application To Changing Deltasmentioning

confidence: 99%

Future Change to Tide‐Influenced Deltas

Nienhuis

Hoitink

Törnqvist

2018

Geophysical Research Letters

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“…Rivers maintain approximately constant along‐channel width and depth under steady boundary conditions (Dunne & Jerolmack, 2020; Hey & Thorne, 1986; Leopold & Maddock, 1953; Mikhailov, 1970). Approaching the coast, tides can lead to an expansion of the channel width, resulting in a trumpet or funneled shape from seaward increase in discharge and tidal volume (Langbein, 1963; Savenije, 2006).…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Scour in Response to Tidal Dominance in Estuaries

et al. 2021

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Estuaries and deltaic channels are dynamic environments at the transition from the river to the ocean (Figure 1). These coastal channels are of special importance for mankind in terms of transport (de Vriend et al., 2011) and ecological value (Bouma et al., 2005). The surrounding land is often densely populated (Edmonds et al., 2020), with 21 of the world's 30 largest cities being located next to estuaries (Ashworth et al., 2015).

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“…;Magirl and Olsen (2009);McCandless and Annapolis (2003);McCandless and Everett (2002);Mikhailov (1970);Miller (1958);Moody and Troutman (2002);Mulvihill and Baldigo (2012);Pugh and Redman (2019);Rachol and Boley-Morse (2009); Rhoads (1991);Sweet and Geratz (2003);Xu (2004). DHS, downstream hydraulic geometry.…”

mentioning

confidence: 99%

Rationalizing the Differences Among Hydraulic Relationships Using a Process‐Based Model

Coco

Townend

et al. 2021

Water Resources Research

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An ancient Chinese proverb states: "Don't push the river, it flows by itself." Scientists and engineers have long struggled to fully translate the second part of the proverb into a mathematical description. Leopold and Maddock (1953) linked the time-varying measurements of instantaneous river width B, depth H and velocity U at a gauging station to the corresponding discharge Q using simple power functions, and termed such empirical relationships as at-a-station hydraulic geometry (denoted as "AHG" hereafter). At the same time, the authors created downstream hydraulic geometry (denoted as "DHG" hereafter) to describe the hydraulic relations with bankfull (or mean annual) B, H, U, and Q downstream along a river. The fundamental difference between these two relationships is that AHG deals with temporal variability while DHG focuses on spatial variability. In addition, the mean annual or bankfull parameters used in DHG generally have a longer returning period than the time-varying parameters of AHG. Despite their conceptual difference, both AHG and DHG were expressed by the same well-known functional forms:

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Hydrological-Morphometric Characteristics of Danube Delta Branches in the Backwater Zone

Cited by 11 publications

References 1 publication

Future Change to Tide‐Influenced Deltas

Future Change to Tide‐Influenced Deltas

Large‐Scale Scour in Response to Tidal Dominance in Estuaries

Rationalizing the Differences Among Hydraulic Relationships Using a Process‐Based Model

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