【題目】河口攔門沙（又稱河口壩）是發(fā)育在河口地區(qū)的一種常見的地貌單元。磨刀門水道是珠江八大口門之一，磨刀門水道前端發(fā)育的交杯沙系列沙壩是珠江河口壩體系的一部分，它是由河道徑流、海洋波浪及潮汐共同作用形成的。交杯四沙—燈籠沙—白藤島—三灶島之間是一條呈喇叭狀的潮道。下圖示意磨刀門水道的形態(tài)特征，MN為交杯四沙的一條剖面線。讀圖完成下面小題。

【1】P處泥沙移動所受的主要外力來自

A. 河流 B. 洋流 C. 潮汐 D. 波浪

【2】燈籠沙水下沉積物以細(xì)砂沉積為主的主要原因是

A. 珠江含沙量小 B. 地轉(zhuǎn)偏向力的作用

C. 采砂強(qiáng)度較大 D. 潮汐、波浪和徑流作用大致相當(dāng)

【3】交杯四沙

①漲潮時M側(cè)以堆積為主 ②漲潮時M側(cè)以侵蝕為主

③落潮時N側(cè)以堆積為主 ④落潮時N側(cè)以侵蝕為主

A. ①② B. ③④ C. ②④ D. ①③

【答案】

【1】A

【2】D

【3】C

【解析】

【1】讀圖，P處位于河流入�？�，正對著入海徑流方向，泥沙移動所受的主要外力來自河流，A對。河流入�？谔�，洋流、潮汐、波浪對泥沙移動有影響，不是主要因素，B、C、D錯。

【2】燈籠沙水下沉積物以細(xì)砂沉積為主的主要原因是潮汐、波浪和徑流作用大致相當(dāng)，D對。珠江含沙量小，不是沉積細(xì)沙的原因，A錯。與地轉(zhuǎn)偏向力的作用無關(guān)，B錯。采砂強(qiáng)度較大，顆粒越大，C錯。

【3】交杯四沙漲潮時M側(cè)正對潮水來向，以侵蝕為主，①錯、②對。落潮時對受潮水沖擊，N側(cè)以侵蝕為主，③錯、④對。C對，A、B、D錯。

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