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In order to protect the environment and check the emission of polluted gas, this article conducts research on energy saving and emission reduction technologies for marine diesel engines and their applications. In order to achieve this goal, we can improve and optimize combustion efficiency, improve combustion efficiency and combustion efficiency of diesel engines, and use new engines with higher and cleaner energy sources when using new energy sources with higher efficiency and less diesel, thus reducing pollution and achieving environmental protection objectives. The application of energy-saving and emission reduction technology in marine diesel engines can make them more efficient, improve efficiency, and facilitate combustion of diesel engines, reduce nitrogen oxides, recover heat generated by diesel engines, and improve energy consumption.

China is one of the countries with frequent flood disaster, and it does fall often with more precipitation especially from June to October in the Yangtze River, which would very easily cause floods thereby seriously threating to the safety of each region along the Yangtze River. How to manage regional flood risk reasonably and efficiently under the new situation of the joint effects of climatic change and human activities deserves more researches. The regional flood risk management model is built and applied in the Jingjiang section of the Yangtze River to derive regional flood processes under the condition of floodwall break and assess the effects of flood on each factor in the region. The built model is reliable and practical with reasonable results, would support some sort of technical help for regional flood risk management, water resources protection and measure-making of flood prevention and disaster mitigation.