夜光遥感视域下东平湖非法采砂和移民行为监测OA

[Objective]Nighttime light remote sensing is employed to analyze the correlation between nighttime light variations and activities such as illegal sand mining and migration in the Dongping Lake area,thereby providing decision-making refer-ences for the governance and planning of the lake.[Methods]NPP/VIIRS and Luojia 1-01 nighttime light remote sensing data were used,along with socioeconomic data and prior information of illegal activities in the river and lake basin.An im-proved hidden Markov model image optimization algorithm based on a time sliding window was applied to analyze illegal sand mining and migration activities in the Dongping Lake at a large spatial scale.The regional nighttime light intensity index and regional nighttime light gradient index were adopted as statistical indicators to characterize the overall nighttime light distribu-tion in the Dongping Lake area.[Results]The results showed that from 2013 to 2020,nighttime light and illegal sand min-ing activities in the lake surface of Laohu Town showed a downward trend.From 2014 to 2015,the regional nighttime light in-tensity index decreased by 37.2%.Additionally,illegal sand mining activities in the southern part of the lake area decreased sharply,indicating effective control of such activities.In 2019,nighttime light in the lake area had nearly vanished,and ille-gal sand mining activities had ceased entirely.Migration activities were concentrated between 2013 and 2017.In 2017,night-time light in the northern part of the lake area disappeared,indicating the completion of the relocation.In 2020,the return migration to Laohu Town proceeded smoothly,and faint nighttime light reemerged in the Huyuan community in the northern part of the lake area.With socioeconomic development,human activities became more active.Nighttime light in the flood de-tention area showed an increasing trend,with the weighted radiation intensity value rising at an average of 5.31%per year from 2015 to 2020.[Conclusion]Nighttime light remote sensing can effectively monitor the spatiotemporal changes in illegal sand mining and migration activities in Dongping Lake,with the results aligning closely with governance effectiveness.In the future,nighttime light remote sensing can be integrated into a dynamic monitoring system for rivers and lakes,providing tech-nical support for evidence collection related to illegal activities and for population migration analysis.