两图片的对比可以清楚揭示出该区流域的洪水情况。
A comparison between the two images reveals flooding on nearly every river system.
本文提出了在有历史洪水情况下洪水频率的非参数核估计方法，克服了现行方法假定分布型式的局限。
A nonparametric kernel estimation of the flood frequency with historic information is presented in this paper. The limitation in assuming a distribution type is overcome.
应用推荐