DeXiang Huang ^1,2 Yongfu Sun ^1* Wei Gao ¹ WeiKun Xu ¹ Wei Wang ^1,3 YiXin Zhang ^1,3 Lei Wang ²

• ¹ National Deep Sea Center (NDSC), Qingdao, Shandong Province, China
• ² College of Ocean Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong Province, China
• ³ Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, Shandong Province, China

The western Pacific seamount area is abundant in both biological and mineral resources, making it a crucial location for international investigation of regional seabed resources. An essential stage in comprehending and advancing seamounts is gaining knowledge about the distribution characteristics and laws governing the seabed substrate. Deep-sea geological sampling is challenging because of the intricate nature of the deep-sea environment, resulting in increased difficulty in identifying and evaluating substrates. This study addresses the aforementioned issues by utilizing in-situ video footage obtained from the "Jiaolong" manned deep submersible and shipborne deep-water multibeam data. This data is used as a foundation for constructing a Western Pacific seamount areas substrate classification point set. Additionally, the paper introduces the mRMR-XGBoost substrate classification model. Substrate categorization in deep sea and mountainous regions has been successfully accomplished, yielding a classification accuracy of 92.5%. The classification experiments and box sampling results demonstrate that the mRMR-XGBoost substrate classification model proposed in this paper can efficiently use acoustic and optical data to accurately divide the substrate types in seamount areas, with better classification accuracy, when compared with commonly used machine learning models. It has a significant application value and the best classification effect on the two types of substrates: nodules and gravel substrates.