Based On The Quantitative Remote Sensing Inversion Of Granularity Of West-south Of Laizhou Bay Tidal Flat Surface Sedimentary Evolution

The Yellow River delta is one of the most well-known continental depositing weaktidal deltas around the world. During the recent decades, its estuary, tidal flat andlandform have been changing frequently. However, with the Yellow River Deltaefficient and ecological economic zone has been included in the national strategicplanning area, the urban planning, industrial structure and layout, environmentalprotection and resource utilization of this region all demand that the prediction to theevolution of future tidal flat sediment and trend of coastal landform erosion anddeposition be more accurate and precise. In view of many previous studies on thesedimentary dynamic processes of Yellow River estuary, the diffusion of suspendedsediment and the evolution of dynamic and landform of abandoned estuary-subdeltasand several important coastal segments, this paper, on the basis of inversion ofquantitative remote sensing grain size parameters, will regard the western-southerncoastline as a unified landform and research its evolution mechanism and trend of tidalflat surface deposition in the past decades from the perspective of scale so as to revealthe relationships among the tidal flat surface sediment western-southern coastline ofLaizhou Bay and changes of the Yellow River estuary and sediment discharge andcoastal sedimentary dynamic processes in recent40years.With analyzing the collected238samples of tidal flat surface sediment and thereflectance at the southern bank of the west coast and selecting12imagines of theremote sensing between1973to2015, the author have tested and analyzed the data.Through analyzing the clay content, the silt content, sand content and the averageparticle size, construct the reflectance spectra between the BP neural network modeland the SVM model. With analyzing the correlation coefficient between the predicteddata and the practical data on the different models, the author decided to choose theSVM model as the appropriate model in the research. Based on the optimal model andutilizing the pretreatment data of the remote sensing to investigate the surface sedimentof Zhou bay west coast..According to the result of the inversion, the author carried outa research in the west-south tidal flat and the factors of the surface sedimentaryevolution and got the developing trend.With analyzing the result of the tidal flat surface sediment inversion from1973to 2015, the author have the follow findings:The tidal flat surface at the southern bank of the west bay is different from theother tidal flat surface with these follow factors which include the Yellow River changeits channel, river estuary sediment changes into the sea, the marine dynamic conditionsand human activities and the other factors. These factors have mutual influences andrestrict each other and the tidal flat surface has changed a lot in recent40years.From1973to1978, tidal flat surface sediment at the southern bank of the west ofthe Laizhou bay. The average content of clay, the silt content of the average value andthe average particle size are increased, but the sand content showed a trend of reducing;From1978to2015, the average tidal flat surface sediment content of clay soil and siltcontent are decreasing and the average value and the particle size, sand content haveshowed a trend of increase.By a clear ditch of Qingshuigou, the west tidal flat surface sedimentary evolutionof the Laizhou Bay is obviously different from the south coast. The tidal flat surfacesedimentary of the west coast evolution is affected by the Yellow River channel change,the estuarine sediment migration into the sea and the comprehensive effect of themarine dynamic conditions. The south of Laizhou bay tidal flat surface sedimentaryevolution is mainly influenced by the river sediment, near the shore sediment of theinfluence of the marine power (tide and wave etc.) With the condition of resuspension,transporting and a series of other factors, the evolution process becomes slow.From1973to2015, the evolution of Laizhou bay west-south with the surfacesedimentary tidal flat is under the background of the overall decrease on sediment ofthe Yellow River into the sea. The river landscape change, the sedimentary dynamicsystem, and the impact of human activity also have an influence on it.Based on the analysis of the final inversion results verify with quantitative remotesensing inversion, the west of Laizhou bay and the south tidal flat surface sedimentaryevolution trend and the bay sedimentary dynamic system, the tendency of the estuarylandscape change have the similarities. This help to solve the problems of shortage ofhistorical sediment samples, and the problem of discontinuity and incomplete. For thesupervision of tidal flat surface sediment and the research of tidal flat sedimentaryevolution, the motivation, the morphological evolution of dynamic monitoring provides a practical and simple and the convenient method.