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【題目】紅軍長征是一部驚心動魄、氣壯山河的史詩。赤水河為長江上游支流。1935年1月至3月，紅軍在茅臺-赤水斷成功四渡赤水。下圖為赤水河流域圖。

說明紅軍渡河季節該河段的水文特征及其成因。

【答案】(10分）該地區屬于亞熱帶季風氣候，河流以降水補給為主；（2分）冬春季降水少；（2 分）故河流處于枯水期，流量較小（水位較低)；（2分）流量減少（侵蝕搬運能力減弱），含沙量較小：（2分）冬春手節氣溫多在0℃以上（或較低)，不結冰（或水溫較低）。（2分）

【解析】

試題分析：該河段在云貴高原，屬于亞熱帶季風氣候，河流以降水補給為主；渡河是在1-3月，是冬春季，該季降水少，故河流處于枯水期，流量較小，水位較低；流量減少，河流的侵蝕搬運能力減弱，含沙量較小；且冬春手節氣溫較低，但是亞帶河流不結冰，但水溫較低。

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