DYNAMIC MONITORING OF RECLAMATION TO ANALYZE WETLAND CHANGES USING TIME-SERIES REMOTE SENSING IMAGERY

With the development of social economy and marine resources exploitation, reclamation activities become an important way to ease the shortage of coastal land and promote the development of coastal cities. Reclamation activities bring economic benefits and at the same time also bring great threat for offshore resources and coastal wetland ecosystem. At the end of the river, estuarine delta is a dynamic balancing system formed by the interaction of the hydrological process of river, sea and land. Because of its geographical position superiority, estuarine deltas often become populated areas of reclamation activity. Time-series remote sensing data, such as LANDSAT data hold considerable promise for investigating long-term dynamics of land use/cover change (LUCC), given their significant advantages of frequent temporal coverage and free cost. In this paper, through the support vector machine automatic interpretation method, the LUCC information for Liaohe estuary wetland from 1987 to 2014 was obtained using the LANDSAT images as the data source. Systems analysis of dynamic evolution characteristics was implemented for reclamation and land cover types in Liaohe wetland ecosystem. The reclamation estimation on the wetland ecosystem service function value loss was established, and the driving effect of reclamation on the evolution of wetland research was considered. Results show that ( 1) rapid growth for sea aquaculture and reclamation in 1987-1989 and the process slowed down in 1989-2000. Later during the period 2004-2014, the area of sea reclamation project increased rapidly (2) Liaohe estuarine wetland had been subject to much change. This resulted from direct and indirect impacts of the project of reclamation and marine aquaculture. The ecosystem service value was response to the wetland land use/cover changes. So it was concluded that the LUCC information can provide a reference for both ecological restoration and compensation funds after the formation of reclamation and effective wetland protection measures are needed informed by the change analysis.