颗粒物捕集器在港口疏浚监测中的应用

Application of the particulate matter trap in dredged port monitoring

颗粒物捕集器技术首次应用到港口疏浚监测中 ,通过对现场疏浚悬浮颗粒物的监测以及对生物的急性半致死浓度的模拟实验研究 ,建立了一套较完整的疏浚监测系统和技术 ,可以更有效和直观地反映疏浚过程对养殖海区生物的影响。现场调查和实验结果表明 :在疏浚区和养殖区交界处疏浚悬浮物在海水表面的垂直通量为 1 2 68mg/(cm2 d) ,中层为 2 5 4 1mg/(cm2 ·d) ;在养殖中心区表层为 7 5 8mg/(cm2 ·d) ,中层为 1 1 60mg/(cm2 ·d)。长时间的疏浚 ( 30d以上 ) ,对附近养殖区栉孔扇贝的生长有一定影响 ,甚至造成死亡。

The particulate matter trap technique is applied for the dredged material monitoring first, combined the acute half lethal concentration of the organisms with the dredged material. It efficiently, directly shows the marine environmental change in dredging processes to develop a whole set of the monitoring system and technique, especially for the influence on the organisms in an aquaculture areas. The results of the field investigating and experiment shows that the vertical flux of the dredged suspended particulate matter in the interface of the dredged areas and aquaculture areas is 11 84 mg/(cm 2·d) in the surface water and is 20 45 mg/(cm 2·d) in the middle water, while vertical flux in the center of aquaculture areas is 7 92 mg/(cm 2·d) in the surface water and is 11 02 mg/(cm 2·d) in the middle water. The dredging processes for a long period of time (above 30 d) influenced the growth and heavy lethality for the chlamys farreri.