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10 September 2008 Analysis on causes/evolution of floods over the Songhua main stream basin and the properties of the 1998 deluge over the Song-Nen Plain
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Abstract
Floods over the main-stream basin of the Songhua River in NE China are characterized by 24 and 3 ~ 4 year periods, and by 4 phases: 1911-1914, 1930-1940, 1954-1958 and 1984-1998. The flooding frequency is increased remarkably as time goes on. The paper is devoted to the direct cause of the flooding due to July ~ August flash rainfall in the Nen River valley and the Second Songhua - Gelin River catchment area, for which the 500 hPa circulation background is studied, that is, the July ~ August anomalous pattern of the Tibetan plateau to Alaska exhibits a "+ - + -" structure, with a blocking high over the Okhotsk Sea and NE China under the control of a trough. In the year of flooding the Aleutian low deepens in the spring, extending westward and the Ural high is established and moves east. The 1998 deluge over the Song-Nen Plain was related broadly to the circulation pattern anomaly and excessive precipitation except that much-more-than-record rainfall occurred in June and August over the Nen River basin.
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Nanping Xu, Pinwen Guo, Guihua Zhang, Meiying Yuan, and Huasheng Pan "Analysis on causes/evolution of floods over the Songhua main stream basin and the properties of the 1998 deluge over the Song-Nen Plain", Proc. SPIE 7083, Remote Sensing and Modeling of Ecosystems for Sustainability V, 708316 (10 September 2008); https://doi.org/10.1117/12.794702
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