Study on noise reduction of rainfall at Shizhu Station and protection of villages along Nanxi River

Abstract Nanxi River is one of the largest tributaries in the lower reaches of Oujiang River. There are many traditional villages along the river. When there are more rainy seasons or typhoon storms, floods will occur in the basin. There is Shizhu hydrological station on the main stream of Dananxi in the lower reaches of the basin. Shizhu station is the flood control station in the middle and lower reaches of Nanxi River, which plays an important reference role in flood prevention of Nanxi River. Due to the influence of many factors, rainfall data contains system noise and measurement noise. The analysis and calculation of the model parameters from the rainfall series with noise can not truly reflect the nature of the rainfall system. The reliability of data and the accuracy of data analysis results can be improved by denoising rainfall series. In this paper, the wavelet denoising method is used to denoise the annual rainfall series of Shizhu station, and its useful rainfall data is obtained. The amount of rainfall has a direct impact on the socio-economic development along the line, the health of the ecological environment and the people's living and working in peace and contentment on both sides of the Nanxi River. The research results can provide basic data for flood control and water resources utilization of Nanxi River, and enable relevant departments to take measures in advance to ensure the safety of people's living environment and sustainable development of ecological environment, and provide technical support for Rural Revitalization in Nanxi River.