大长山岛海底输水管道工程对海域环境影响的初步探讨

Preliminary Study on the Environmental Influence of Under Sea Water Pipeline Engineering Crossing Dachangshan Island

针对里长山水道的自然环境特点,建立数据值模型。选择沿输水管线上两个开挖段作为污染源,对施工期间产生的悬浮物对海域环境的影响作了初步的探讨。结果揭示:在两开挖段上,其悬浮物的浓度最大增值均不超过10.0mg/L,影响范围仅在距污染源500m以内海域,且这种影响属暂时现象,施工结束后,影响随之消失,仍可保持海域一类水质,不影响该海域功能的开发和利用。

The numerical model is set up on the basis of the natural features in Dachangshan Channel. Two dredging sections are chosen as pollutant sources along the pipeline. The environmental influence of suspended matter produced during construction is preliminarily discussed. The results of simulation indicate that the increase of the concentration of suspended matter during construction is not larger than 2. 6mg/L at the dredging section A and not larger than 2. 0mg/L at the dredging section B, and the maximum increase is not larger than 10. 0mg/L. The influenced area was not further than 500m from the dredging spot. This kind of influence is temporal and would vanish soon after construction. The water quality would remain the first class standard in this area and the dredging engineering will not have a great influence on the environment.