The measurement of sand transport in two inlets of Venice lagoon, Italy

被引:17
作者
Amos, C. L. [1 ]
Villatoro, M. [1 ]
Helsby, R. [1 ]
Thompson, C. E. L. [1 ]
Zaggia, L. [2 ]
Umgiesser, G. [2 ]
Venturini, V. [1 ]
Are, D. [3 ]
Sutherland, T. F. [4 ]
Mazzoldi, A. [2 ]
Rizzetto, F. [2 ]
机构
[1] Natl Oceanog Ctr, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England
[2] CNR, Inst Marine Sci, Venice, Italy
[3] SELC SpA, Marghera, Italy
[4] DFO CAER, W Vancouver, BC V7V 1N6, Canada
关键词
sand transport; tidal inlets; Venice lagoon; SUSPENDED-LOAD TRANSPORT; BOUNDARY-LAYER DYNAMICS; BED SHEAR-STRESS; SEDIMENT-TRANSPORT; COHESIVE SEDIMENTS; SETTLING VELOCITY; RIPPLED BED; FLOW; THRESHOLD; GRAINS;
D O I
10.1016/j.ecss.2009.05.016
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Sand transport in Lido and Chioggia inlets was measured using modified Helley-Smith sand traps equipped with 60-micron nets. The traps had an efficiency of about 4% only but provided enough material for analysis. Very fine sand (0.07 < d < 0.11 mm) only was collected in the traps. Transport of sand was greatest in the bottom 10% of the water column and followed a Rouse profile. Sand extended to a height of about 4 m above the bed during peak flows corresponding to the estimated thickness of the boundary layer; and observed in synoptic ADCP profiles. The sand in the benthic boundary layer was largely inorganic (>95%); above this layer, organic content varied widely and was greatest near the surface. The movability number W-s/U. showed a linear relationship to dimensionless grain diameter (D-): (W-s/U*) = (D*/10); D* < 10. Sand concentration in suspension was simulated by a mean Rouse parameter of -2.01 +/- 0.66 (Lido inlet) and -0.82 +/- 0.27 (Chioggia inlet). The beta parameter (Hill et al., 1988) was correlated with D* and movability number in the form: beta = 2.07-2.03D* + 59(W-s/U*)(2) (r(2)=0.42). Von Karman's constant was back-calculated from a Law of the Wall relationship as a test on the accuracy of U. estimates; a mean value of 0.37 +/- 0.1 (compared to the accepted value of 0.41) suggest U* was accurate to within 10%. The constant of proportionality (gamma = 3.54 x 10(-4)) between reference concentration (C-a) and normalized excess bed shear stress was in line with the published literature. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:225 / 236
页数:12
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