Inversion Of Ice Thickness And Its Variation Characteristics In Wanjiazhai Reservoir Area Based On Remote Sensing Data

Ice observation is the premise of anti-lingling,and it is the basis of ice research.Therefore,comprehensive and accurate ice observation can provide a reliable basis for scientific anti-ling.Ice thickness data is one of the important indicators to monitor the flood disaster.This paper uses the ice thickness inversion algorithm to remotely invert the ice thickness data,and uses the Lebedev model to verify the inversion results,and analyze the changes of the results during the year..The results of inversion of ice thickness can provide reference for practical work such as flood prevention and disaster reduction in the inner Mongolian section of the Yellow River.The conclusions reached are as follows:Through the ice thickness inversion algorithm,the river ice thickness inversion is performed for a specific year,and the inversion results are compared with the measured data.The upstream ice thickness of the upper reaches of the Wanjiazhai Reservoir in the Yellow River continued to increase,and reached the maximum in the stable period.The average ice thickness during the steady period of river ice was between 40cm and 50cm,until the river ice began to melt in early March.The ice thickness began to thin to the river.The results of satellite remote sensing inversion and actual measurement and Lebedev model verification results(correlation coefficient above 0.8)explain the effectiveness of remote sensing inversion to some extent.The variation of ice thickness of ice growth,stream,initial seal,stable seal,melting ice and river opening.This paper selects the river ice image data from 2010 to 2011 and the stable period from 2005 to 2019,and analyzes the changes of ice thickness between the year and the year,and obtains the law of change.During the year,the change of ice thickness was retained from the WD57 section,and the tail of the pile of ice continued to move upwards.The density of the stream continued to increase and the ice thickness gradually increased.During the closure of the river,the upper and lower water levels in the tail of the pile of ice were very wide and the ice was thicker.During the period from January 19 to February 4,2011,intermittent trenches appeared.On February 13th,the ice was extremely thick.After that,the ice thickness gradually thinned to the river.During the inter-annual flow,the flow rate of the river is high and low,and some sections are frozen,and some sections are not frozen.In the early stage of stabilization,the overcurrent capacity was the smallest,and then increased slightly.The ice thickness showed different changes over the years.During this period,the temperature fluctuated greatly,and the ice sheet was unstable.It was easy to form an ice dam and cause ice storms.After obtaining the trend of river ice thickness change,the possible factors affecting the variation of ice thickness are analyzed comprehensively.The ice thickness of the upper reaches of the Wanjiazhai Reservoir in the Yellow River is mainly affected by the temperature during the early icing period,and the variation within the day is large;The effect of temperature on the ice sheet causes the ice thickness to increase almost linearly.In addition,changes in ice flow and water levels play a crucial role in ice thickness.