Study on the change monitoring of typical estuarine wetland and its effect on ecological factors in Bohai Rim region, China

Estuarine wetlands provide an especially ecological home for various flora and fauna, with fragile structures functions easily affected by the external disturbances of both anthropogenic natural activities. Recently, (such as water marsh) Bohai Rim region have been, continue to be, lost or altered under influence local urbanization economic development. There is increasing need crucial essential wetland change detection one most critical works relevant research. The paper’s objective focuses on detecting annual interannual changes at a large spatial scale understanding mainly changed cover type estuarine measuring its impact coastline factors. Two typical study areas, including Shuangtai Estuary Yellow River Delta, are selected assessment in region, China. Additionally, Landsat TM/OLI images between 2005 2015, standard years detection, used experimental data resources. To realize rapid automatic larger scale, method constructed extract information from satellite integrating dynamic ratio max-difference algorithm. Based remote sensing base index (RSEI), three indexes include body index, vegetation soil calculated maximum difference inter-annual rate wetland. Furthermore, graded evaluated five significant levels yearly scales. Results show several findings: (1) overall improvement trend was two monitoring areas region. factors positively area (improve) more significant, converted expansion paddy field. In negatively changing (degrade), insignificant, main bare land. (2) significantly increased accumulation normalized (NDVI) feature regional Delta were interaction factors, included modified (MNDWI), NDVI, (NDSI). different periods enriches technology wetlands, betters quantitative evaluation provides updated support resource inventory