scholarly journals Export of suspended solids and dissolved elements from peatland areas after ditch network maintenance in south-central Finland

Silva Fennica ◽  
2010 ◽  
Vol 44 (1) ◽  
Author(s):  
Mika Nieminen ◽  
Erkki Ahti ◽  
Harri Koivusalo ◽  
Tuija Mattsson ◽  
Sakari Sarkkola ◽  
...  
Keyword(s):  
Suspended Solids ◽  
South Central ◽  
Network Maintenance

scholarly journals Impact of a high rainfall event on the water level, current velocity, and total suspended solids in tidal flats environments of the estuarine Cruces River wetland, south-central Chile

2021 ◽  
Vol 49 (1) ◽  
pp. 188-192
Author(s):  
Mario Manzano ◽  
Eduardo Jaramillo ◽  
Mario Pino
Keyword(s):  
Surface Waters ◽  
Suspended Solids ◽  
Environmental Variability ◽  
Total Suspended Solids ◽  
Tidal Flats ◽  
Rainfall Event ◽  
Rainfall Events ◽  
Central Chile ◽  
South Central ◽  
Coseismic Subsidence

The effects of a sudden rainfall (40 mm d-1) event on the surface waters covering muddy tidal flats were studied during April 2016 at the estuarine Cruces River wetland in south-central Chile (~40ºS). The study area included flooded vestigial tree trunks, which is evidence of coseismic subsidence associated with the 1960 Valdivia earthquake as a source of environmental variability. The tidal flat with vestigial tree trunks registered the fastest and highest depth of inundation. In contrast, the tidal currents velocity and total suspended solids' concentrations were higher at the flat without trunks. Sudden rainfall events can significantly modify the characteristics of surface waters above sedimentary intertidal surfaces, where structures such as flooded trunks are present.

scholarly journals Seasonal and Intra-Event Nutrient Levels in Farmed Prairie Potholes of the Des Moines Lobe

2019 ◽  
Vol 62 (6) ◽  
pp. 1607-1617
Author(s):  
Alexander R. Martin ◽  
Michelle L. Soupir ◽  
Amy L. Kaleita
Keyword(s):  
Surface Water ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Prairie Pothole ◽  
Des Moines Lobe ◽  
South Central ◽  
Des Moines ◽  
Field Management ◽  
Concentration Changes ◽  
Total P

HighlightsNitrogen, total phosphorus, and total suspended solids concentrations were higher in early season inundation.Nitrate concentrations in farmed potholes decreased with multiday ponding.Farmed potholes act as hotspots, contributing P to drainage through surface intakes.Abstract. The prairie pothole region ranges from central Iowa to the northwest into Montana and south-central Canada, totaling around 700,000 km2. This area contains millions of potholes, or enclosed topographical depressions, which often inundate with rainfall. Many are located in areas that have been converted to agricultural land through installation of artificial drainage. However, even with drainage, potholes pond or remain saturated during and after significant rain events. In this two-year study, surface water depth was collected hourly (typically from after planting through harvest) from eight farmed potholes (drained and under corn-soybean rotation) on the Des Moines Lobe in central Iowa. Nutrient data were collected daily and tested for nitrogen (N) and phosphorus (P) when inundation depth exceeded 10 cm. The data were analyzed in two ways. First, seasonal differences were investigated using samples from the first day of each inundation event. Surface water concentrations were higher in the early growing season than late season for total N (TN), NO3-N, NH3-N, total P (TP), and total suspended solids (TSS). Secondly, average event concentration changes were determined. Nitrate reductions occurred in 85% of multiday events, but these reductions were offset by increases in P. Total P and dissolved reactive P (DRP) had significant increases that averaged 0.51 and 0.46 mg L-1 per event, respectively, with event lengths of 2 to 19 days. This study demonstrates that inundated farmed potholes reduce NO3-N but serve as in-field hotspots, contributing elevated TP and DRP to drainage waters. When a surface intake directly connects inundated farmed potholes to drainage, new strategies, such as field management or engineered technologies, are needed to mitigate P export. This study is useful in informing policy regarding field management and conservation of farmed potholes. Keywords: Farmed wetland, Nitrogen, Nutrients, Phosphorus, Prairie pothole.

PRELIMINARY FINDINGS OF OIL-SOLIDS INTERACTION IN EIGHT ALASKAN RIVERS

2001 ◽  
Vol 2001 (2) ◽  
pp. 845-849 ◽  
Author(s):  
James McCourt ◽  
Larry Shier
Keyword(s):  
Stream Flow ◽  
Suspended Solids ◽  
Historical Data ◽  
Significant Degree ◽  
South Central ◽  
Yukon River ◽  
Solids Concentration ◽  
High Concentrations ◽  
The Times ◽  
Mineral Aggregates

ABSTRACT The formation of oil-mineral aggregates in rivers with high concentrations of suspended solids could be an important mechanism for transferring oil from a surface slick into the water column. Seven glacier-fed rivers in south-central Alaska were sampled three times in the summer of 1999 and tested to see how suspended solids in the water would interact with crude oil. Oil-mineral aggregates formed with all samples, which lead to the conclusion that similar oil-solids interaction should occur if oil is spilled into other glacier-fed rivers. The amount of oil associated with the solids after mixing was roughly proportional to the concentration of suspended solids in the samples. The oil-loading results ranged between 0.01 and 0.45 g oil/g solid, with most of the measurements falling between 0.03 and 0.24 g oil/g solid. The average loading for all tests was 0.13 g oil/g solid, which is consistent with the findings of a similar study done in 1998 on the Yukon River. This result indicates that the suspended solids in the streams studied—especially the larger Yukon, Copper, and Lowe Rivers—have a large oil-holding capacity and would be capable of scavenging a considerable volume of oil. The exact quantity would depend on several factors, including the volume and dimensions of the slick, concentration of suspended solids, and current velocity of the river. Historical data on stream flow, suspended-solids concentration, and particle-size distribution were gathered and used in conjunction with the laboratory oil-solids interaction results to identify the times of the year when such interaction could occur to a significant degree. This data indicated that oil-mineral aggregates are expected to form in all rivers tested, with the most significant periods being during the summer months.

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