At present, there are few operational indexes to assess the impact of a given human pressure taken alone. Nevertheless, the current challenge in the management of coastal marine environments in the framework of cumulative impacts and climatic change is to identify the relative contribution of each activity on ecosystem functioning. The objective of the present study is to propose an integrative approach to assess the environmental impacts of dumping operations, via the development of a new index, the Dredge Disposal Sediment Index (D²SI). From the selection of two types of station: impacted and unimpacted, D²SI integrates six sub-indices considering the biological and physical changes generated by dredge disposal on the seabed. A final score is proposed, according to the five classes of the European Water Framework Directive. The initial development of D²SI was conducted on the experimental dumping site of Machu (Bay of Seine), by applying a BACI (Before-After-Control-Impact) approach. An additional implementation (D²SI₂) is used in the case of absence of data on ichthyofaunal or biological traits of life of macrobenthic fauna, which yields a comparable assessment of dumping pressure.

In the future, the D²SI or D²SI₂ indexes should be tested on other dumping sites with a view to comparing the assessment of this dumping activity.

当前，很少有可操作的指标来评估给定的人为压力带来的影响。然而，在累积影响和气候变化框架内管理沿海海洋环境的当前挑战是确定每种活动对生态系统功能的相对贡献。本研究的目的是提出一种综合方法，通过开发新的指标-疏Se处置沉积物指数（D ² SI）来评估倾倒作业对环境的影响。从两种类型的站点中选择：D ²和受影响的SI集成了六个子索引，其中考虑了在海底进行挖泥处置产生的生物和物理变化。根据欧洲水框架指令的五类标准，提出了最终分数。D ² SI的最初开发是通过应用BACI（控制前-影响后）方法在马丘（塞纳湾）的实验性倾倒场进行的。如果缺少有关大型底栖动物的鱼类的鱼类或动植物生命特征的数据，则使用另一种实现方式（D ² SI ₂），从而得出可比较的倾倒压力评估。

将来，应在其他倾销场所测试D ² SI或D ² SI ₂指数，以比较对此倾销活动的评估。