珠江三角洲陈村水道航道整治对该区域水环境影响评价

Evaluation of the influence of dredging the navigation tract on the aquatic environment around the Chencun water in the Zhujiang Delta

目的:通过预测陈村水道整治工程的主要水污染因子对评价区域水质量造成影响的程度与范围,为制定防治措施及对策提供依据.方法:采用水质预测模型对陈村水道水质进行预测.结果:在河流的横向分布上,疏浚工程产生的悬移质污染可扩大至河流的对岸水域.纵向分布上,工程点由1艘、2艘挖泥船厂施工时,距离排污口50m处,悬浮物(SS)质量浓度增值最大分别为196 84、228 12mg/L,已超广州市污水排放标准;施工期悬浮物对沿线水厂吸水口的影响:对紫坭糖厂水厂几乎没有影响,对钟村水厂及碧桂园水厂有一定的影响,对西三水厂影响相对较大.营运期船舶污染物排放量以含油废水增加量最大为11 35%,生活污水及垃圾次之,均为11 32%.结论:疏浚工程所引起的SS对河道水质的影响是暂时的,陈村水道整治工程完成后,有利于改善水动力条件及水道水环境质量.

Aim:By evaluating the extent and range of the influence of the major water polluting factors on water quality around the assessment area in Chencun dredging, we can provide basis for making preventive treatment and countermeasure. Methods: The water quality of Chencun stream was estimated by the predictive model of water quality. Results: The suspended substance of the dredging construction diffused across the river. Along the river, when one or two dredgers in operation, the max consistency of SS 50 meters from the discharge pollute site was 196.84 mg/L or 228.12 mg/L, exceeding the level of water pollute discharge in Guangzhou. During construction, SS acting on the water plant. The water quality of Zini water plant was almost unaffected. That in Zhongcun or Biguiyuan was somehow affected, but greater influence took place in Xishan water plant. Shipping discharged waste materials with oil as maximum (11.35%) and sewage and rubbish coming next (11.32%). Conclusion: The influence of SS acting on water quality around Chencun water is temporary. After the dredging, the aquatic condition and aquatic environment quality will be improved.