Book of Selected Works . Kn. 2. River hydraulics . Filtration theory. Aerodynamics and Gas Dynamics . Mining . The theory of plasticity" is a unique publication that combines outstanding research and development in the field of hydraulics, aerodynamics and mining. Compiled by a team of authors, this book is a valuable resource for students, graduate students and professionals working in related fields of science and technology. The second volume of Selected Works immerses the reader in the world of river hydraulics, where key aspects of the interaction of water with various objects and structures are considered. The author’s team shares in-depth knowledge about how rivers and streams shape the landscape, as well as how these processes can be used to effectively manage water resources. The filtering theory presented in the book reveals the mechanisms underlying the movement of fluid through porous media, which is important for environmental research and engineering solutions. Aerodynamics and gas dynamics are another important topic addressed in this edition. Readers will be able to learn about the principles that govern the movement of air and gases, as well as how this knowledge is applied in various industries, from aviation to the automotive industry. The book also addresses mining issues, including mining methods and their impact on the environment. The theory of plasticity, in turn, provides readers with an understanding of the mechanical properties of materials, which is key to the design and analysis of structures. This book will be interesting not only for students and graduate students of technical specialties, but also for practicing engineers, researchers and anyone interested in modern technologies and their application in real life. It will be an indispensable tool for those who want to deepen their knowledge in the field of hydraulics, aerodynamics and mining, as well as for those who seek to apply scientific knowledge in practice. The style of the authors is characterized by high scientific rigor, but at the same time the availability of presentation. Each section of the book is written so that the reader can easily learn complex concepts and ideas. This makes the "Selected Works. Kn. 2" not only useful, but also fascinating reading for all who seek to expand their horizons in the field of science and technology. The book also raises important topics such as sustainable development and environmental protection, making it relevant in the context of contemporary challenges facing humanity. Readers will be able to reflect on how scientific advances can help to solve environmental problems, and how engineering solutions can contribute to more efficient use of natural resources. If you're looking for literature that combines scientific depth and practical applicability, then "Selected Works. Kn. 2" will be a real find for you. This book will not only enrich your knowledge, but also inspire new ideas and projects. Do not miss the opportunity to touch the world of science and technology, which opens before you on the pages of this edition.