【摘要】：2013—2014年,在遼東灣六股河口兩側(cè)開展了海灘地形及海岸侵蝕的現(xiàn)場(chǎng)調(diào)查,于興城至綏中沿海布設(shè)6處調(diào)查岸段及17條斷面。結(jié)果表明,研究海灘地貌主要組成部分包括反射型高潮灘-灘坎-消散型低潮灘,其中低潮灘多發(fā)育有近岸沙壩和水下沙壩。綏中南江屯、皮家屯及興城新立屯海灘侵蝕明顯,多數(shù)海灘持續(xù)侵蝕,調(diào)查期內(nèi)最大平均下蝕速率達(dá)53.2cm/a。分析發(fā)現(xiàn),海灘地形及斷面蝕淤量有較明顯的季節(jié)或區(qū)域差異。海灘冬季近岸沙壩消失、水下沙壩離岸距離小于夏季。六股河口南側(cè)夏季海灘斷面侵蝕量增加、淤積量減少,而六股河口北側(cè)相反。研究認(rèn)為,岸線自然形態(tài)差異及其造成的沿岸輸沙差異是導(dǎo)致不同岸段蝕淤差異的主要自然原因。海岸封閉性建筑物(尤其是突堤)影響了海灘局部斷面蝕淤變化。海灘地貌及蝕淤的季節(jié)或區(qū)域變化的主要原因?yàn)檠匕恫ɡ颂卣鞯纫蛩氐募竟?jié)性和區(qū)域性差異。
[Abstract]:In 2013-2014, the beach topography and coastal erosion were investigated on both sides of Liugu estuary in Liaodong Bay, and 6 investigation sections and 17 sections were set up in Xingcheng to Suizhong coastal areas. The results show that the main components of the study beach landform include the reflective high tide beach-bank-dissipated low tide beach, in which there are mostly nearshore sand dams and underwater sandbars. In Suizhong Nanjiangtun, Pijiatun and Xinlitun of Xingcheng, the beach erosion is obvious, and most of the beaches continue to erode. The maximum average erosion rate during the investigation period is 53.2 cm / a. It is found that there are obvious seasonal or regional differences in beach topography and cross-section erosion and deposition. Beach inshore sand dams disappear in winter, and the offshore distance of underwater sand dams is smaller than that in summer. On the south side of Liugu estuary, the erosion amount of beach section increases and the amount of deposition decreases, but the north side of Liugu estuary is opposite. It is considered that the main natural reason for the difference of erosion and siltation in different coastal sections is the difference of natural morphology of shoreline and the difference of coastal sediment transport caused by it. The coastal closed buildings (especially the breakwater) affect the erosion and siltation of the local section of the beach. The seasonal or regional variations of beach landforms and erosion and siltation are mainly due to seasonal and regional differences in coastal wave characteristics.
【作者單位】： 國(guó)家海洋環(huán)境監(jiān)測(cè)中心;河北省科學(xué)院地理科學(xué)研究所;
【基金】：國(guó)家海洋局預(yù)報(bào)減災(zāi)司全國(guó)海岸侵蝕監(jiān)測(cè)評(píng)價(jià)與預(yù)警遼東灣試點(diǎn)項(xiàng)目 國(guó)家海洋公益性科研專項(xiàng)“海島旅游海灘管理技術(shù)研究與應(yīng)用示范”(201405037) 河北省科學(xué)院科技計(jì)劃項(xiàng)目“河北省海域承載力及典型海洋災(zāi)害預(yù)警”;“河北省環(huán)首都山區(qū)水土流失與地質(zhì)災(zāi)害防控研究”
【分類號(hào)】：P737.1
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本文編號(hào)：2378751