Optimal allocation of sampling effort in lake sediment studies

1995 ◽  
Vol 52 (10) ◽  
pp. 2146-2158 ◽  
Author(s):  
David J. Rowan ◽  
Joseph B. Rasmussen ◽  
Jacob Kalff
Keyword(s):  
Optimal Allocation ◽  
A Priori ◽  
Sediment Accumulation ◽  
Point Sources ◽  
Sampling Effort ◽  
Sediment Texture ◽  
Lake Morphometry ◽  
Accumulation Rates ◽  
Sediment Characteristics ◽  
Sediment Distribution

A sampling algorithm requiring only bathymetric and catchment parameters has been derived from several recent empirical developments and should drastically reduce the number of sites and replicates necessary to characterize the distribution, trace element concentrations, and sediment accumulation rates of lake sediments. A test of this algorithm with sediments from 96 sites in three basins of morphometrically complex Jack Lake, Ontario, demonstrates the utility of this approach. A priori application of the algorithm would have reduced the number of sample sites on our sampling grid from 96 to 22 (a reduction of 77%), without losing precision. This reduction in sample sites (and in time and money expended) would allow for sampling additional lakes or sites of local significance (e.g., river or creek mouths, pollution point sources), or measuring additional parameters. The relationships between lake morphometry, sediment distribution, and sediment texture, along with the relationships between sediment texture and inter- and intra-site variability, can also be used to extrapolate sediment characteristics from a few samples to the whole lake or to predict the zone to which sediment is focused.

Accumulation and recycling of PCBs and PAHs in artificially eutrophied Lake 227

1999 ◽  
Vol 56 (4) ◽  
pp. 650-660 ◽  
Author(s):  
Jeff D Jeremiason ◽  
Steven J Eisenreich ◽  
Michael J Paterson
Keyword(s):  
Phytoplankton Community ◽  
Sediment Accumulation ◽  
Point Sources ◽  
Accumulation Rates ◽  
Experimental Lakes Area ◽  
High Accumulation ◽  
Northwestern Ontario ◽  
Polycyclic Aromatic ◽  
Contaminant Accumulation

The influence of lake trophic status on the cycling and burial of polychlorinated biphenyls (PCB's) and polycyclic aromatic hydrocarbons (PAH's) was examined in Lake 227 (L227), an artificially eutrophied lake in the Experimental Lakes Area, northwestern Ontario, Canada. Sedimentary accumulation of PCB's, PAH's, and organic carbon (OC) was determined pre- and post-eutrophication in L227 and compared with accumulation in other regional lakes. Mass and OC accumulation increased an average of 1.4 and 2.0 times, respectively, since nutrient addition began in June 1969. ΣPCB and ΣPAH sediment accumulation rates and profiles in L227 were similar to those in Lake Superior and other proximate and midlatitude lakes unimpacted by point sources. Eutrophication did not increase contaminant accumulation. In general, individual PAH accumulation rates declined following eutrophication, which coincided with similar signals elsewhere. Perylene declined markedly (4 times) since eutrophication as a result of decreased in situ formation. An increase in OC accumulation did not enhance contaminant accumulation in L227 because phytoplankton community structure shifted to species characterized by lower bioaccumulation factors, and water column recycling rates were high. Accumulation rates of mass, OC, PCB's, and PAH's, when compared with ice-free settling fluxes in 1993 and 1994, exhibited similar recycling ratios in eutrophic L227 and oligotrophic L110 due to the efficient preservation of organic matter in sediments.

scholarly journals Perubahan Garis Pantai di Perairan Muara Sungai Musi Hubunganya dengan Sedimentasi

2020 ◽  
Vol 23 (2) ◽  
pp. 217-224
Author(s):  
Beta Susanto Barus ◽  
Ellis Nurjuliasti Ningsih ◽  
Melki Melki
Keyword(s):  
Sediment Trap ◽  
Sediment Accumulation ◽  
Sedimentation Rates ◽  
Accumulation Rates ◽  
Sediment Characteristics ◽  
Shoreline Changes ◽  
Sedimentary Characteristics ◽  
Negative Effect ◽  
Port Construction ◽  
Land Changes

Musi Estuary is strongly influenced by various land activities such as plantations, industry, agriculture and others. These activities have a negative effect on the condition of these waters, one of which is sedimentation. Sedimentation is an important factor that must be considered during development such as port construction and reclamation. This study aims to analyzed the dynamics of shoreline changes in the Musi Estuary, South Sumatra associated with sediment characteristics and sedimentation rates in the area. This research was carried out by installing a sediment trap for 14 days. Trapped sediments were taken once a week and calculated the volume and rate of sediment accumulation. The results showed that the dominant sedimentary characteristics in Musi Estuary were dominated by clay and mud with sediment accumulation rates ranging from 86,63-97,97 mg/cm2/day. The results of the dynamics of shoreline changes in the form of abrasion at stations 2, 3, 4, 5 and 6 and sedimentation at Station 1. The highest land change by abrasion was found at station 6 with land changes ± 129, 83 meters in 5 years and land changes by sedimentation at station 1 with a reduction in land ± 13.31 meters in 5 years.  Muara Sungai Musi merupakan perairan muara yang sangat dipengaruhi oleh berbagai aktivitas daratan seperti perkebunan, industri, pertanian dan lain-lain. Aktivitas tersebut memberikan efek negatif terhadap kondisi perairan tersebut, salah satunya adalah sedimentasi. Sedimentasi menjadi faktor penting yang harus diperhatikan pada saat melakukan pembangunan seperti pembangunan pelabuhan dan reklamasi. Penelitian ini bertujuan untuk menganalisis dinamika perubahan garis pantai di Perairan Muara Musi, Sumatera Selatan dikaitkan dengan karakteristik sedimen dan laju sedimentasi di daerah tersebut. Penelitian ini dilakukan pada bulan November 2019 dan pengambilan sampel dilakukan dengan memasang sedimen trap selama 14 hari. Sedimen yang terperangkap diambil seminggu sekali dan dihitung volume dan laju akumulasi sedimen. Hasil penelitian menunjukkan bahwa karakteristik sedimen yang dominan di Muara Musi didominasi oleh tanah liat dan lumpur dengan tingkat akumulasi sedimen berkisar antara 86,63-97,97 mg/cm2/hari. Hasil dinamika perubahan garis pantai dalam bentuk abrasi di stasiun 2, 3, 4, 5 dan 6 dan sedimentasi di stasiun 1. Perubahan lahan oleh abrasi tertinggi ditemukan di stasiun 6 dengan perubahan lahan ±129,83 meter dalam 5 tahun dan perubahan lahan oleh sedimentasi di stasiun 1 dengan pengurangan lahan ±13,31 meter dalam 5 tahun.

SEDIMENT ACCUMULATION RATES QUANTIFIED WITH COSMOGENIC NEON-21 ON A GLACIAL MORAINE, BLOODY CANYON, CA

2017 ◽  
Author(s):  
Daniel Morgan ◽  
◽  
Greg Balco ◽  
Alison Cribb ◽  
J. Warner Cribb ◽  
...  
Keyword(s):  
Sediment Accumulation ◽  
Accumulation Rates

SEDIMENT ACCUMULATION RATES AND TRACE METAL INPUT HISTORY IN LAKE MANASSAS AND THE OCCOQUAN RESERVOIR, VIRGINIA, USA

2019 ◽  
Author(s):  
Grace Rihl ◽  
◽  
Ben K. Odhiambo ◽  
Leanna Giancarlo ◽  
Daniel Arango
Keyword(s):  
Trace Metal ◽  
Sediment Accumulation ◽  
Accumulation Rates

The assessment of 210Pb data from sites with varying sediment accumulation rates

Hydrobiologia ◽  
1983 ◽  
Vol 103 (1) ◽  
pp. 29-35 ◽  
Author(s):  
P. G. Appleby ◽  
F. Oldfieldz
Keyword(s):  
Sediment Accumulation ◽  
Accumulation Rates

Linked variations in sediment accumulation rates and sea-level in Guanabara Bay, Brazil, over the last 6000years

2014 ◽  
Vol 415 ◽  
pp. 83-90 ◽  
Author(s):  
Alberto G. Figueiredo ◽  
Mauro B. de Toledo ◽  
Renato C. Cordeiro ◽  
José M.O. Godoy ◽  
Fabiano T. da Silva ◽  
...  
Keyword(s):  
Sea Level ◽  
Sediment Accumulation ◽  
Guanabara Bay ◽  
Accumulation Rates ◽  
And Sea Level

Impacts of human activity on the late-Holocene development of the subaqueous Yangtze delta, China, as shown by magnetic properties and sediment accumulation rates

The Holocene ◽  
2010 ◽  
Vol 21 (3) ◽  
pp. 393-407 ◽  
Author(s):  
Zhanghua Wang ◽  
Maotian Li ◽  
Ruihu Zhang ◽  
Chencheng Zhuang ◽  
Yan Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Human Activity ◽  
Late Holocene ◽  
Sediment Accumulation ◽  
Accumulation Rates ◽  
Yangtze Delta ◽  
Impacts Of Human Activity

scholarly journals High-resolution magnetostratigraphy of the upper Nacimiento Formation, San Juan Basin, New Mexico, USA: implications for basin evolution and mammalian turnover

2017 ◽  
Author(s):  
Caitlin Leslie ◽  
Daniel J. Peppe ◽  
Thomas E. Williamson ◽  
Dario Bilardello ◽  
Matthew Heizler ◽  
...  
Keyword(s):  
New Mexico ◽  
North America ◽  
Accumulation Rate ◽  
Global Climate ◽  
Sediment Accumulation ◽  
San Juan ◽  
Accumulation Rates ◽  
Fluvial System ◽  
San Juan Basin ◽  
Geomagnetic Polarity

Lower Paleocene deposits in the San Juan Basin document one of the best records of mammalian change and turnover following the Cretaceous-Paleogene extinctions and are the type section for the Puercan (Pu) and Torrejonian (To) North America Land Mammal age biozones (NALMA). One of the largest mammalian turnover events in the early Paleocene occurs between the Torrejonian 2 (To2) and Torrejonian 3 (To3) NALMA biozones. The Nacimiento Formation are the only deposits in North America where the To2-To3 mammalian turnover can be constrained, however the precise age and duration of the turnover is poorly understood due to the lack of a precise chronostratigraphic framework. We analyzed paleomagnetic samples, produced a 40Ar/39Ar detrital sanidine age, and developed a detailed lithostratigraphy for four sections of the upper Nacimiento Formation in the San Juan Basin, New Mexico (Kutz Canyon, Escavada Wash, Torreon West and East) to constrain the age and duration of the deposits and the To2-To3 turnover. The polarity stratigraphy for the four sections can be correlated to chrons C27r-C26r of the geomagnetic polarity time scale (GPTS). Using the local polarity stratigraphy for each section, we calculated a mean sediment accumulation rate and developed a precise age model, which allows us to determine the age of important late Torrejonian mammalian localities. Using the assigned ages, we estimate the To2-To3 turnover was relatively rapid and occurred over ~120 kyr (-60/+50 kyr) between 62.59 and 62.47 Ma. This rapid duration of the mammalian turnover suggests that it was driven by external forcing factors, such as environmental change driven by the progradation of the distributive fluvial system across the basin and/or changes in regional or global climate. Additionally, comparisons of the mean sediment accumulation rates between the sections that span from the basin margin to the basin center indicate that sediment accumulation rates equalized across the basin from the end of C27r through the start of C26r, suggesting an accommodation minima in the basin associated with the progradation of a distributive fluvial system into the basin. This accommodation minimum also likely led to the long hiatus of deposition between the Paleocene Nacimiento Formation and the overlying Eocene San Jose Formation.

Age of the Yarrabee and accessory tuffs: implications for the upper Permian sediment-accumulation rates across the Bowen Basin

2016 ◽  
Vol 63 (7) ◽  
pp. 843-856 ◽  
Author(s):  
S. A. Ayaz ◽  
M. Martin ◽  
J. Esterle ◽  
Y. Amelin ◽  
R. S. Nicoll
Keyword(s):  
Sediment Accumulation ◽  
Upper Permian ◽  
Accumulation Rates

scholarly journals 240+239Pu depositional signatures as a viable geochronological tool in the Amazon Basin

2017 ◽  
Vol 44 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Luciana M Sanders ◽  
Kathryn H Taffs ◽  
Debra Stokes ◽  
Alex Enrich-Prast ◽  
Christian J Sanders
Keyword(s):  
Amazon Basin ◽  
Environmental Science ◽  
Sediment Cores ◽  
Sediment Accumulation ◽  
Recent Sediment ◽  
Floodplain Lake ◽  
Accumulation Rates ◽  
Amazon Floodplain ◽  
Dating Methods ◽  
Lead 210

AbstractAnthropogenic radionuclide signatures associated with nuclear testing are increasingly utilized in environmental science to explore recent sedimentation. In this study, we assess the suitability of Pu radioisotope analysis in floodplain lake environments in the Amazon Basin to form geochronologies during the 20thcentury. The240Pu +239Pu (240+239Pu) signatures in six sediment cores indicate sediment accumulation rates in the floodplain lakes of the major rivers; Amazon (2.3 mm year-1), Tapajos (10.2 and 2.4 mm year-1) and Madeira (3.4, 4.2 and 6.2 mm year-1). The results from this study show that240+239Pu fallout activities, and the well documented (240Pu/239Pu) atomic ratios of the above ground nuclear tests which began in the 1950’s, are sufficient and well preserved in Amazon floodplain lake sediments to infer chronologies. Lead-210 dating analyses in the same sediment cores produced comparable sediment accumulation rates at three of the six sites. The differences between dating methods may be attributed to the different time scale these dating methods represent and/or in the solubility between Pb and Pu along the sediment column. The geochronologies derived from the240+239Pu and210Pb dating methods outlined in this work are of interest to identify the effects of changing sediment accumulation rates during the previous century as a result of development, including deforestation, along the Amazon Basin which increased towards the middle of the 20thcentury. This study shows that Pu dating provides a viable alternative geochronology tool for recent sediment accumulation (previous ~60 years) along the Amazon Basin.

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