| The Liao River is one of the most important rivers in northeastern China.The water system of the Liao River Basin is also one of the seven major river systems in China.The names of Liaoning Province and Liaoning Peninsula are all derived from Liao.The Liao River divides Liaoning Province into two halves,the east of the Liao River is called “Liaodong”,and the west of the Liao River is called“Liao Xi”.At the same time,Liao was also hailed as the mother river by the people of northeast China.The Liao River has a total length of 1345km,and its watershed has a drainage area of 232,000km2,but its average flow rate is only 500m3/s,which is only about 1/12 of the Pearl River.Because the soil flowing through the area is mostly silty sand,the Liao River also has a very high sediment carrying capacity.The upstream rivers of the Liao River also carry a very rich nutrient material,and formed a large-scale ecological wetland in the Liao River.The most famous one is the Pan Jin Red Beach Ecological Wetland.However,with the influence of a series of human factors such as the development and construction of the estuary,the ecological environment of the Liao estuary wetland has suffered various degrees of damage,and it faces the reduction of biodiversity,the reduction of wetland area,the pollution of wetland water,the reduction of ecological regulation capacity,etc.Column problem[1].Therefore,the ecological restoration of the Liao estuary wetland needs to be carried out,and it is particularly important to master the hydrodynamic conditions of the estuary wetland.As a land where sea and land meet,the estuary wetland develops tidal creeks with uneven scales through the long-term dynamics of tidal waves.Therefore,it is possible to accurately and massively invert the estuarine wetland intertidal zone and tidal creek information for mastering the estuary.The hydrodynamic situation is very basic and important.In this paper,the waterside line of Liao estuary is extracted based on image segmentation method,and the intertidal zone edge of Liao estuary is reversed by the tidal level correction model.Finally,the measured data and high-definition aerial data are used to determine the tidal ditch of Liao estuary.See the interpretation method.Through research,this paper has achieved the following results:?1?Extraction of waterside lines.Based on the near-infrared band of Landsat8,the threshold segmentation,mathematical morphology and edge detection method were used to extract the Liao estuary tidal flat at the time of satellite imaging based on the characteristics of the tidal beach coastline.At the same time,this study aimed at the characteristics of the muddy tidal flats in the Liao estuary,improved the methods of the predecessors,and extracted the tidal flats with relatively blurred waterside lines,and achieved good results.?2?Inversion of the intertidal zone edge.Using the harmonic constants of two tide stations near the Liao estuary,the tidal level of the satellite imaging time is predicted,and the tide level correction model and two remote sensing images are used to invert the intertidal zone edge of the Liao estuary,and the results are discussed.The research results show that the error of inversion of the intertidal zone is small for the waterside line with a small difference between the two tidal levels;and the inversion result error of the intertidal zone with the waterfront with a large difference between the two tidal levels Larger.?3?Determination of the tidal trench interpretation rules.Through the aerial data and the measured cross-section data,the interpretation rules of the tidal tunnel in Yuan Yang island in Liao estuary are determined.The comparison of the measured data shows that the spatial error of the tidal groove extraction is about 5%. |
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