Sediment Monitoring Bias by Automatic Sampler in Comparison with Large Volume Sampling for Parking Lot Runoff

被引:10
作者
Roseen, Robert M. [1 ]
Ballestero, Thomas P. [1 ]
Fowler, George D.
Guo, Qizhong [2 ]
Houle, James
机构
[1] Univ New Hampshire, Dept Civil Engn, UNH Stormwater Ctr, Durham, NH 03824 USA
[2] Rutgers State Univ, Dept Civil & Environm Engn, Piscataway, NJ 08854 USA
关键词
Stormwater management; Suspended sediment; Particle size; Sampling; Runoff; Storm water; PARTICLE-SIZE DISTRIBUTION; HIGHWAY RUNOFF; 1ST FLUSH; STORM-WATER; EVENTS;
D O I
10.1061/(ASCE)IR.1943-4774.0000168
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
A field study was conducted to assess biases of suspended sediment concentration (SSC) analyses (ASTM Standard D3977-97) performed on discrete samples obtained by automatic sampler in comparison with actual sediment concentrations from large volume sampling. Research results indicate that the biases attributed to the monitoring of sediment event mean concentration (EMC) and median particle size in parking lot runoff by automated samplers (nonisokinetic) were minimal. Large volume samples (similar to 15,000 L) of the first-flush event runoff were taken from a storm-water sewer system for eighteen storm events over two years. The intent was to obtain a complete portion of a storm to accurately determine EMCs and particle size distributions (PSDs). Concurrently, flow-weighted discrete samples were obtained by automatic samplers for the same portion of the events. Thus, characteristics of sediments from a whole-storm sample were compared with those of subsamples obtained by an automatic sampler using nonisokinetic sampling. SSCs and PSDs were compared for the two respective field sampling methods. The two methods showed a strong correlation for median sediment EMCs (R-2 = 0.98, n = 18). Biases to particle size distributions were found to be both for the large particles (> 75-150 mu m) and smaller fines (< 25 mu m). Specific sediment size fractions captured by the large volume sampling and automatic sampler were not significantly different (alpha = 0.05) for D-50, which = 58 and 46 mu m, respectively. DOI:10.1061/(ASCE)IR.1943-4774.0000168. (C) 2011 American Society of Civil Engineers.
引用
收藏
页码:251 / 257
页数:7
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