The results show that the Manning roughness coefficient increases with increasing water depth.

试验结果表明，曼宁粗糙系数随水深深度的增加而增加。

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It is also found that, when the water depth is fixed, the Manning roughness coefficient increases as the longitudinal pier spacing increases up to approximately the pier width.

值得一提的是，当水深维持不变时，曼宁粗糙系数也会持续增加直至纵向基桩间距与其宽度相同为止。

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It is also found that, when the water depth is fixed, the Manning roughness coefficient increases as the longitudinal pier spacing increases up to approximately the pier width.

值得一提的是，当水深维持不变时，曼宁粗糙系数也会持续增加直至纵向基桩间距与其宽度相同为止。

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