A preliminary study on marine environment recovery in Dingzi Bay based on numerical simulation

Dingzi Bay was positioned as the cultural tourism industries cluster, after the Shandong Peninsula Blue Economic Zone Plan was approved as the national strategy. However, in recent decades, the natural coastline and ecological environment in Dingzi Bay were severely damaged due to excessive reclamation for shrimp pools and salt fields. At present, the weak hydrodynamic condition, severe sedimentation, combined with breeding waste and domestic sewage, not only led to ecological environment overload, but also led to low efficiency of sea use in Dingzi Bay. Therefore, numerical simulation was applied for hydrodynamic condition, water exchange rate and tidal capacity changes without aquaculture and saline dams. The numerical simulation results showed that the hydrodynamic condition was significantly enhanced, half-life time was shorter and tidal capacity was nearly increased more than one times in Dingzi Bay after the demolition of the existing shrimp pools and salt fields. Thus, dam’s demolition has important significance for marine environment quality improvement, sediment sedimentation remission, pollutant dilution ability enhancement and marine environmental capacity increase in Dingzi Bay. Moreover, some suggestions were put forward in order to promote the efficiency usage of regional resources and the sustainable development.