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flood control of Huaihe River
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flood control of Huaihe River
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工学
〔主要江河防洪〕
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flood control of Huaihe River
淮河防洪
淮河流域地处南北气候过渡带,洪水灾害频繁。流域性大洪水,常常是干支流洪水遭遇,平原区洪涝并发。其防洪的重点是中下游广大平原区,有淮北平原、里下河、南四湖和沂沭河下游地区。这些地区保护的人口多达4000万~5000万人,保护的农田都在270万~350万公顷。
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orthogonal sum
orthogonal surfaces
orthogonal system
orthogonal system of curves
orthogonal system of functions
orthogonal system of vectors
orthogonal table
orthogonal table; orthogonal layout
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orthogonal transformation
orthogonal transformation group
orthogonal triangulation decomposition
orthogonal vector
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