【摘 要】
：
In Brazil some big river passes inside the city.During the rain season,it causes civil troubles because of water-plant on the surface of river.We like to de
【机 构】
：
Federal Univ.of Parana
论文部分内容阅读
In Brazil some big river passes inside the city.During the rain season,it causes civil troubles because of water-plant on the surface of river.We like to decide the surface condition of distribution of water-plant to approximate the desired velocity of water flow such that we can reduce civil troubles for society.
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