水保所知识产出(1956---)知识库

对已发表的土壤侵蚀数据采用信噪比进行去噪处理，对比分析去噪前后数据在研究影响因子对因变量
影响的显著性、贡献率及拟合优度等方面的差异，确定去噪方法对土壤侵蚀相关试验的适用性。结果显示:去
噪前后的数据都能识别出土壤侵蚀速率、径流速率、流速及径流输移能力等因变量变化的主导因子，但去噪处
理能增加影响因子对观测变量的贡献率，降低误差项的贡献率，明显增大预测值与实测值之间的决定系数、
Nash-Sutcliffe 效率系数及相对均方根误差，减小预测值与实测值之间的绝对误差和相对误差。说明去噪处理
能有效提高影响因子对观测因变量的解释程度，减小试验误差对试验结果的影响，确保试验结果的准确性。

 The compound channel divides the waterway for large and small ships by excavating two parallel
shallow water channels on both sides of the original deep water channel，which can efficiently improve the nav-
igation passage，and has a broad application prospect． Due to the compound cross section，the evolution of
waves crossing the compound channels are more complicated than the traditional single channel，which impact
on the safe navigation in compound channels and sediment transport seriously． A numerical wave tank for the
compound waterway channel of the Tianjin Port is established to simulate the evolution of orthogonal incident
waves in different section types of compound channels． The results show that the wave height increases in where
the small channel is excavated，while in the main channel is basically unchanged． As the width of the small
channel and the slope of the channel transition decreases，the wave height in the compound channel also in-
creases; and water depth ratio and wave elements have a coupling effect on wave height evolution． The shear
stress of wave boundary layer on bed in the main channel is 68. 5% of the shear stress in the small channel，
which is able to block part of the mud and the bed load to alleviate the main channel deposition．