《北史·列传·卷三十四》
孝文帝率大军到达徐州，命成淹与闾龙驹二人专门负责筹集船只，准备由泗水渡入黄河，再西上返回洛阳，军队到了郂，成淹认为黄河水流湍急，怕出危险，便上疏劝谏。
帝幸徐州，敕淹与闾龙驹专主舟楫，将汎泗入河，溯流还洛。军次磝碻，淹以黄河浚急，虑有倾危，乃上疏陈谏。
Emperor Xiaowen led a large army to Xuzhou and ordered Cheng Yan and Lu Longju to take specific responsibility for collecting ships, in preparation for crossing the Si River and entering the Yellow River, then heading west to return to Luoyang. When the army reached Bo, Cheng Yan believed that the flow of the Yellow River was too fast, and fearing that this would be dangerous, he submitted a memorial offering his advice.