Reductions in Fluvial Sediment Discharge by Coastal Dams in California and Implications for Beach Sustainability

Willis, Cope M.; Griggs, Gary B.

doi:10.1086/345922

Cited by 150 publications

(131 citation statements)

References 5 publications

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“…1). Average sediment trapping efficiency for dams in the central California coastal region have been estimated as ~ 84% by Willis and Griggs (2003) with the simple Brune (1953) method.…”

Section: Study Region Characteristicsmentioning

confidence: 99%

Suspended sediment behavior in a coastal dry-summer subtropical catchment: Effects of hydrologic preconditions

Gray¹,

Warrick²,

Pasternack³

et al. 2014

Geomorphology

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“…1). Average sediment trapping efficiency for dams in the central California coastal region have been estimated as ~ 84% by Willis and Griggs (2003) with the simple Brune (1953) method.…”

Section: Study Region Characteristicsmentioning

confidence: 99%

Suspended sediment behavior in a coastal dry-summer subtropical catchment: Effects of hydrologic preconditions

Gray¹,

Warrick²,

Pasternack³

et al. 2014

Geomorphology

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“…1). Although approximately 54 % of the southern California watershed is controlled by dams, this region of southern California has relatively few dams (Willis and Griggs 2003). A combination of steep slopes and intense, isolated periods of rainfall have yielded daily averaged suspended sediment concentration beyond 70,000 mg/L several times throughout the stream gauge record (Warrick and Farnsworth 2009a).…”

Section: Regional Settingmentioning

confidence: 99%

Balanced Sediment Fluxes in Southern California’s Mediterranean-Climate Zone Salt Marshes

Rosencranz

Ganju

Ambrose

et al. 2015

Estuaries and Coasts

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Salt marsh elevation and geomorphic stability depends on mineral sedimentation. Many Mediterraneanclimate salt marshes along southern California, USA coast import sediment during El Niño storm events, but sediment fluxes and mechanisms during dry weather are potentially important for marsh stability. We calculated tidal creek sediment fluxes within a highly modified, sediment-starved, 1.5-km 2 salt marsh (Seal Beach) and a less modified 1-km 2 marsh (Mugu) with fluvial sediment supply. We measured salt marsh plain suspended sediment concentration and vertical accretion using single stage samplers and marker horizons. At Seal Beach, a 2014 storm yielded 39 and 28 g/s mean sediment fluxes and imported 12,000 and 8800 kg in a western and eastern channel. Western channel storm imports offset 8700 kg exported during 2 months of dry weather, while eastern channel storm imports augmented 9200 kg imported during dry weather. During the storm at Mugu, suspended sediment concentrations on the marsh plain increased by a factor of four; accretion was 1-2 mm near creek levees. An exceptionally high tide sequence yielded 4.4 g/s mean sediment flux, importing 1700 kg: 20 % of Mugu's dry weather fluxes. Overall, low sediment fluxes were observed, suggesting that these salt marshes are geomorphically stable during dry weather conditions. Results suggest storms and high lunar tides may play large roles, importing sediment and maintaining dry weather sediment flux balances for southern California salt marshes. However, under future climate change and sea level rise scenarios, results suggest that balanced sediment fluxes lead to marsh elevational instability based on estimated mineral sediment deficits.

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“…Dune ecosystems provide protection against flooding [48], though beach width and sediment supply are also relevant [91]. While there is sea level rise of 2.2-2.5 mm per year in Galicia, there are also cases of dune propagations exceeding 100 m per year [60,92,93].…”

Section: Resilience Indicators-beach Structurementioning

confidence: 99%

Vulnerability of Coastal Beach Tourism to Flooding: A Case Study of Galicia, Spain

et al. 2017

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Flooding, as a result of heavy rains and/or storm surges, is a persistent problem in coastal areas. Under scenarios of climate change, there are expectations that flooding events will become more frequent in some areas and potentially more intense. This poses a potential threat to coastal communities relying heavily on coastal resources, such as beaches for tourism. This paper develops a methodology for the assessment of coastal flooding risks, based on an index that compares 16 hydrogeomorphological, biophysical, human exposure and resilience indicators, with a specific focus on tourism. The paper then uses an existing flood vulnerability assessment of 724 beaches in Galicia (Spain) to test the index for tourism. Results indicate that approximately 10% of tourism beaches are at high risk to flooding, including 10 urban and 36 rural beaches. Implications for adaptation and coastal management are discussed.

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Reductions in Fluvial Sediment Discharge by Coastal Dams in California and Implications for Beach Sustainability

Cited by 150 publications

References 5 publications

Suspended sediment behavior in a coastal dry-summer subtropical catchment: Effects of hydrologic preconditions

Suspended sediment behavior in a coastal dry-summer subtropical catchment: Effects of hydrologic preconditions

Balanced Sediment Fluxes in Southern California’s Mediterranean-Climate Zone Salt Marshes

Vulnerability of Coastal Beach Tourism to Flooding: A Case Study of Galicia, Spain

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