Recent changes to floodplain character and functionality in England

Entwistle, Neil; Heritage, George; Schofield, Lucy A.; Williamson, R.J.

doi:10.1016/j.catena.2018.11.018

Cited by 39 publications

(18 citation statements)

References 35 publications

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“…Forman parte integrante del sistema fluvial (EEA, 2018) y absorben el exceso de caudal y sedimentos, desempeñando un papel ecológico esencial (Camarasa & Bescós, 2004). Estos sistemas, en su conjunto, representan algunos de los paisajes más dinámicos y ricos del planeta (Radcliffe, 1977;Entwistle et al, 2019).…”

Section: El Concepto De Espacio Fluvialunclassified

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

Vian

Izquierdo

2021

BAGE

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En el presente artículo se analizan los usos del suelo existentes en las zonas de inundación frecuente de las áreas urbanas españolas. Estos se clasifican en grupos, distinguiendo las coberturas naturales de las antrópicas y, dentro de ellas, los usos compatibles y no compatibles con las inundaciones fluviales. El análisis realizado determina y compara el reparto de usos en el espacio fluvial y en las áreas urbanas, estudiando la ocupación de los ríos según la región biogeográfica a la que pertenecen y su temporalidad de flujo. Los resultados muestran que (1) los ríos en las ciudades son potenciales infraestructuras verdes donde abundan las coberturas naturales, espacios ajardinados, agrícolas y ganaderos; (2) se ha ocupado casi tres cuartas partes del espacio fluvial en las áreas urbanas; y (3) la presión antrópica es mayor en los ríos de la región mediterránea y, sobre todo, en los cursos de caudal intermitente. Este trabajo, pone de manifiesto la falta de una ordenación territorial coherente con los espacios fluviales y puede ser útil para contribuir a una sistematización metodológica que permita ampliar y contrastar el conocimiento de esta línea científica.

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Section: El Concepto De Espacio Fluvialunclassified

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

Vian

Izquierdo

2021

BAGE

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“…This is because wetlands as most natural land use [16] cover less than 2% of T-medium and T-frequent floodplains. Although this is more than is reported by Entwistle, Heritage [17] for floodplains in England, it is still far from a natural condition in both floodplain scenarios. Similar is the coverage of riparian floodplains with 8% and no statistical difference between T-frequent and T-medium floodplains.…”

Section: Indicator For Naturalness Of Floodplains and Ecosystem Functioningmentioning

confidence: 54%

“…German English For Germany, not only was a floodplain delineation based on a T-100 floodplain definition carried out, but the condition of this T-100 floodplain was also evaluated by the Federal Agency for Nature Conservation (BfN) together with the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU) [10,15]-in total, only 1% of German floodplains are in a good state, equaling a near natural condition for which multifunctionality of floodplain ecosystems is expected, allowing all services to be provided [16]. In the following, 'functional floodplains' is used analogously to 'functional wetlands,' introduced by Entwistle, Hertiage [17] to describe the habitat in a floodplain fulfilling floodplain-specific functions and underlying regular inundation processes, similar to the term 'multifunctionality of ecosystems' used by Erős and Bányai [16], for example, for retaining water and nutrients, connecting habitats and enhancing water levels through the year. Then, regulating ecosystem services are expected to correlate almost linearly and positively with the ecological status of aquatic ecosystems [18].…”

Section: Applied Nomenclature In This Studymentioning

confidence: 99%

“…Similar is the coverage of riparian floodplains with 8% and no statistical difference between T-frequent and T-medium floodplains. The low coverage of wetlands, forests and waters is similar for T-medium floodplains in Europe [17,34]. However, all are very important for different aspects of biodiversity [4] and as connecting elements.…”

Section: Indicator For Naturalness Of Floodplains and Ecosystem Functioningmentioning

confidence: 99%

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How Flood Hazard Maps Improve the Understanding of Ecologically Active Floodplains

Natho¹

2021

Water

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Floodplains are threatened ecosystems and are not only ecologically meaningful but also important for humans by creating multiple benefits. Many underlying functions, like nutrient retention, carbon sequestration or water regulation, strongly depend on regular inundation. So far, these are approached on the basis of what are called ‘active floodplains’. Active floodplains, defined as statistically inundated once every 100 years, represent less than 10% of a floodplain’s original size. Still, should this remaining area be considered as one homogenous surface in terms of floodplain function, or are there any alternative approaches to quantify ecologically active floodplains? With the European Flood Hazard Maps, the extent of not only medium floods (T-medium) but also frequent floods (T-frequent) needs to be modelled by all member states of the European Union. For large German rivers, both scenarios were compared to quantify the extent, as well as selected indicators for naturalness derived from inundation. It is assumed that the more naturalness there is, the more inundation and the better the functioning. Real inundation was quantified using measured discharges from relevant gauges over the past 20 years. As a result, land uses indicating strong human impacts changed significantly from T-frequent to T-medium floodplains. Furthermore, the extent, water depth and water volume stored in the T-frequent and T-medium floodplains is significantly different. Even T-frequent floodplains experienced inundation for only half of the considered gauges during the past 20 years. This study gives evidence for considering regulation functions on the basis of ecologically active floodplains, meaning in floodplains with more frequent inundation that T-medium floodplains delineate.

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“…Extensive floodplains are usually associated with large rivers, seasonal inundated lakes, and seas. Evidence accumulated from the research regarding anthropogenic interventions and climate change demonstrates that floodplains are presently more prone to external forces, and they are recognized as globally threatened ecosystems [1,2]. In large floodplain systems, hydrodynamic behaviors have gained considerable attention and worldwide recognition, and they play an important role in controlling the mixing that provides critical insights into the transport of water, ecosystem, dissolved matter, and sediments [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

On the Hydrodynamic Behavior of the Changed River–Lake Relationship in a Large Floodplain System, Poyang Lake (China)

2020

Water

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Poyang lake floodplains are hydrologically complex and dynamic systems which exhibit dramatic intra-annual wetting and drying. The flow regime of the Yangtze River was previously known to play an important role in affecting Poyang Lake and its extremely productive floodplains (river–lake relationship). The recent severe declines and recessions in the lake are closely linked to the changed river–lake relationship, resulting in significant hydrological, ecological, and economic problems. This study aims to examine the spatiotemporal heterogeneity of the floodplain hydrodynamic behaviors with respect to impacts of the changed river–lake relationship, characterized by the lake water level, inundation area, and inundation duration based on a floodplain hydrodynamic model of Poyang Lake, and to further quantify the severity of dryness recently endured since 2000. Simulation results show that, in general, the current modified river–lake relationship is more likely to affect the hydrological seasonality of the floodplain system since 2000, relative to the flooding and drying cycles during past decades (1953–2000). The present hydrodynamic behaviors suffered significant change due to the greatest interference from the altered river–lake relationship, particularly for the falling period in October. On average, the floodplain water level and inundation duration decreased by 6 m and 12 days during October, respectively. Additionally, the highest monthly shrinkage rate in floodplain inundation shifted from the period of October–November to September–October, with the mean inundation area decreasing by around 50%, demonstrating an advanced and prolonged dry condition. The spatial responses of the hydrodynamics in the low-slope floodplains are most likely to be affected by the dynamic river–lake relationship, as expected. This study assessed the effects of the altered river–lake relationship on the hydrological regime of the Poyang Lake floodplains in terms of spatiotemporal distributions and changing processes for the periodic inundated behavior, which can support the relevant study of the subsequent ecological effects on the wetlands.

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Recent changes to floodplain character and functionality in England

Cited by 39 publications

References 35 publications

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

How Flood Hazard Maps Improve the Understanding of Ecologically Active Floodplains

On the Hydrodynamic Behavior of the Changed River–Lake Relationship in a Large Floodplain System, Poyang Lake (China)

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