[题目]红军长征是一部惊心动魄.气壮山河的史诗.赤水河为长江上游支流.1935年1月至3月.红军在茅台-赤水断成功四渡赤水.下图为赤水河流域图.说明红军渡河季节该河段的水文特征及其成因. 题目和参考答案——青夏教育精英家教网—

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【题目】红军长征是一部惊心动魄、气壮山河的史诗。赤水河为长江上游支流。1935年1月至3月，红军在茅台-赤水断成功四渡赤水。下图为赤水河流域图。

说明红军渡河季节该河段的水文特征及其成因。

【答案】(10分）该地区属于亚热带季风气候，河流以降水补给为主；（2分）冬春季降水少；（2 分）故河流处于枯水期，流量较小（水位较低)；（2分）流量减少（侵蚀搬运能力减弱），含沙量较小：（2分）冬春手节气温多在0℃以上（或较低)，不结冰（或水温较低）。（2分）

【解析】

试题分析：该河段在云贵高原，属于亚热带季风气候，河流以降水补给为主；渡河是在1-3月，是冬春季，该季降水少，故河流处于枯水期，流量较小，水位较低；流量减少，河流的侵蚀搬运能力减弱，含沙量较小；且冬春手节气温较低，但是亚带河流不结冰，但水温较低。

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