Climate Change and the Episodicity of Sediment Flux of Small California Rivers

Inman, Douglas L.; Jenkins, Scott A.

doi:10.1086/314346

Cited by 278 publications

(211 citation statements)

References 47 publications

(55 reference statements)

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“…climate). Our hypothesis builds on the observations of: (1) Inman and Jenkins (1999) who show a strong positive relationship between sediment flux in the rivers of Southern California and intervals of increased precipitation during the twentieth century; and, (2) Cayan and Peterson (1989), Brito-Castillo et al (2003), and Hanson et al (2006), who show that higher streamflow/precipitation in southwestern North America is associated with a preferred mode of atmospheric circulation akin to the positive/warm phase of the PDO. Our paleo-run-off hypothesis is assessed through comparison to the twentieth century PDO index, Lake Elsinore lake level, San Jacinto River discharge, and sediment grain size over the past 100 years.…”

Section: Introductionmentioning

confidence: 76%

“…8). Inman and Jenkins (1999) have already shown that river sediment flux and regional climate are positively correlated in Southern California. Building on this relationship, we hypothesize that differences in grain size reflect changes in run-off dynamics as coupled to changes in atmospheric circulation.…”

Section: Age Controlmentioning

confidence: 89%

“…Other research from the greater region of California illustrates the sensitivity of the region's landscape to changes in climate. Wetter climates generate greater runoff and drier climates less runoff (Anderson 1977(Anderson , 2001bInman and Jenkins 1999;Hunt and Wu 2004). The asymmetric hydrologic response also provides less time for lake level stagnation in the littoral zone during rapid transgression (than during slow regression) and thus less time to focus fine grained sediment into the profundal zone.…”

Section: Depositional Model For Grain Size Proxymentioning

confidence: 99%

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A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

et al. 2010

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High-resolution terrestrial records of Holocene climate from Southern California are scarce. Moreover, there are no records of Pacific Decadal Oscillation (PDO) variability, a major driver of decadal to multi-decadal climate variability for the region, older than 1,000 years. Recent research on Lake Elsinore, however, has shown that the lake's sediments hold excellent potential for paleoenvironmental analysis and reconstruction. New 1-cm contiguous grain size data reveal a more complex Holocene climate history for Southern California than previously recognized at the site. A modern comparison between the twentieth century PDO index, lake level change, San Jacinto River discharge, and percent sand suggests that sand content is a reasonable, qualitative proxy for PDO-related, hydrologic variability at both multi-decadal-to-centennial as well as event (i.e. storm) timescales. A depositional model is proposed to explain the sand-hydrologic proxy. The sand-hydrologic proxy data reveal nine centennial-scale intervals of wet and dry climate throughout the Holocene. Percent total sand values [1.5 standard deviation above the 150-9,700 cal year BP average are frequent between 9,700 and 3,200 cal year BP (n = 41), but they are rare from 3,200 to 150 cal year BP (n = 6). This disparity is interpreted as a change in the frequency of exceptionally wet (high discharge) years and/or changes in large storm activity. A comparison to other regional hydrologic proxies (10 sites) shows more then

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Section: Introductionmentioning

confidence: 76%

Section: Age Controlmentioning

confidence: 89%

Section: Depositional Model For Grain Size Proxymentioning

confidence: 99%

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A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

et al. 2010

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“…Small rivers in dry-summer subtropical regions, such as coastal California, are particularly prone to episodic hydrologic event control on sediment discharge, as most precipitation occurs during a short winter season that occasionally produces intense storm events (Inman and Jenkins, 1999;Farnsworth and Milliman, 2003;Warrick and Mertes, 2009). …”

Section: U N C O R R E C T E D a C C E P T E Dmentioning

confidence: 99%

“…Mt using monthly and daily Q with log-linear rating curves (Inman and Jenkins, 1999;Farsworth and Milliman, 2003). Ongoing work in this system by the authors has found that suspended sediment load estimated from daily discharge data using a combination of sand and fine suspended sediment rating curves for temporal domains of distinct suspended sediment behavior resulted in an average annual load of ~ 2.2 Mt.…”

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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Unraveling the dynamics that scale cross‐shore headland relief on rocky coastlines: 2. Model predictions and initial tests

Limber

Murray

2014

JGR Earth Surface

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We explore the behavior of a theoretical model of cross-shore headland relief caused by alongshore differences in lithology and rock strength on rocky coastlines. Results address the question of why some rocky coasts exhibit frequent headland and embayment sequences while others evolve to a flat, smooth, and sandy configuration. Main model predictions are that cross-shore headland amplitude is inversely proportional to beach sediment supply and the strength of wave energy convergence and divergence along the headland and bay, and proportional to the alongshore embayment length (or distance between headlands) and the difference between headland and bay rock strength. The coastline's initial physical properties (sea cliff height, composition, etc.) largely determine whether headlands will be persistent or transient landscape features. Model timescales over which the headland and bay reach steady state amplitude, or disappear to a flat coastline, range from 120 to 175,000 years depending on how close the initial amplitude is to steady state. In many cases, the coastline must evolve over several sea level highstands in order to reach equilibrium. A characteristic timescale (independent of initial conditions) shows that the coastline evolves most rapidly when: wave focusing is stronger; sea cliff rock is weaker or retreats faster in a given wave climate; the sea cliff retreat rate decreases rapidly as a function of beach width (i.e., the beach is very effective at dampening wave energy); and the coastline is sediment rich. Comparisons to nature suggest that our model is qualitatively capturing general rocky coastline dynamics and that modeled headland amplitudes are consistent with observed amplitudes.

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Climate Change and the Episodicity of Sediment Flux of Small California Rivers

Cited by 278 publications

References 47 publications

A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

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

Unraveling the dynamics that scale cross‐shore headland relief on rocky coastlines: 2. Model predictions and initial tests

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