The whole-beach quality assessment is the basis of building and preserving beautiful beaches.The beach quality assessment index system and assessment standard have been established based on the attributes of beaches(i...The whole-beach quality assessment is the basis of building and preserving beautiful beaches.The beach quality assessment index system and assessment standard have been established based on the attributes of beaches(including the width,slope,landform,and types),sorting coefficient,and softness degree of surface sediment.The assessment weight of each index for quality evaluation was analyzed using the analytic hierarchy process,and comprehensive scores of selected beach profiles were calculated in accordance with the light assessment standard.A beach quality evaluation model based on index weight and scores was established in this paper.The factors of 12 profiles of Yangkou Beach in Qingdao City were surveyed to carry out a quality assessment,and the comprehensive scores of each profile were calculated in accordance with the evaluation model.The results showed that the quality of Yangkou Beach can be divided into four ratings:excellent,good,medium,and poor.The excellent-quality area includes a wide and flat dry beach zone and soft,flat,and clean intertidal and subtidal zones covered with well-sorted fine sand,and leisure sports,such as volleyball,running,and swimming,are suitable for tourists.The good-quality area features a slightly narrow and dry beach zone,moderately soft and uneven intertidal and subtidal zones covered with fine sand and a small tidal gully,and a small amount of foreign matter;leisure sports,such as walking and running,are suitable for tourists.This study recommends the building of fixed drainage ditches or underground culverts to reduce the tidal gully.The medium-quality area consisted of a narrow and dry beach zone,moderately soft and uneven intertidal and subtidal zones covered by poorly sorted medium sand,a tide ditch,and a small amount of foreign matter.In this area,walking is suitable for tourists.Sand should be supplemented in the intertidal zone.The poor-quality area contained a very narrow and dry beach zone covered with poor-sorted gravel,a very chaotic intertidal zone with a considerable amount of foreign matters,such as bricks and rocks,wide tidal ditches,and an uneven subtidal zone with some reefs;leisure sports are unsuitable here.Thus,foreign matter and reefs should be removed,and the dry beach zone should be supplemented with sand.Therefore,the beach quality assessment is a very useful tool for building beautiful beaches.展开更多
江苏如东县洋口港地区普遍发育末次冰盛期(MIS 2)"第一硬粘土层"。全新世早期,该区暴露侵蚀,仅局部地区发育潮汐水道。全新世中期(7 000 a B.P.)以来,在最大海侵作用影响下,研究区大部分地区以潮坪沉积为主;高海平面时期(5 22...江苏如东县洋口港地区普遍发育末次冰盛期(MIS 2)"第一硬粘土层"。全新世早期,该区暴露侵蚀,仅局部地区发育潮汐水道。全新世中期(7 000 a B.P.)以来,在最大海侵作用影响下,研究区大部分地区以潮坪沉积为主;高海平面时期(5 220 a B.P.),研究区大部分地区处于水下沉积环境;随着海平面下降,北部地区发育古潮成砂体,属于滨海潮坪—潮成砂脊沉积体系。根据地层沉积特征,识别出4期埋藏古潮成砂脊。地层AMS14C年龄表明,4期砂脊是依次在5 220～1 000 a B.P.沉积形成的,反映了潮汐动力作用下古潮成砂脊的动态演化过程。展开更多
基金supported by the Intercollegiate Cooperation Plan of Innovation and Entrepreneurship Training Program for College Students of Beijing City(No.202211012).
文摘The whole-beach quality assessment is the basis of building and preserving beautiful beaches.The beach quality assessment index system and assessment standard have been established based on the attributes of beaches(including the width,slope,landform,and types),sorting coefficient,and softness degree of surface sediment.The assessment weight of each index for quality evaluation was analyzed using the analytic hierarchy process,and comprehensive scores of selected beach profiles were calculated in accordance with the light assessment standard.A beach quality evaluation model based on index weight and scores was established in this paper.The factors of 12 profiles of Yangkou Beach in Qingdao City were surveyed to carry out a quality assessment,and the comprehensive scores of each profile were calculated in accordance with the evaluation model.The results showed that the quality of Yangkou Beach can be divided into four ratings:excellent,good,medium,and poor.The excellent-quality area includes a wide and flat dry beach zone and soft,flat,and clean intertidal and subtidal zones covered with well-sorted fine sand,and leisure sports,such as volleyball,running,and swimming,are suitable for tourists.The good-quality area features a slightly narrow and dry beach zone,moderately soft and uneven intertidal and subtidal zones covered with fine sand and a small tidal gully,and a small amount of foreign matter;leisure sports,such as walking and running,are suitable for tourists.This study recommends the building of fixed drainage ditches or underground culverts to reduce the tidal gully.The medium-quality area consisted of a narrow and dry beach zone,moderately soft and uneven intertidal and subtidal zones covered by poorly sorted medium sand,a tide ditch,and a small amount of foreign matter.In this area,walking is suitable for tourists.Sand should be supplemented in the intertidal zone.The poor-quality area contained a very narrow and dry beach zone covered with poor-sorted gravel,a very chaotic intertidal zone with a considerable amount of foreign matters,such as bricks and rocks,wide tidal ditches,and an uneven subtidal zone with some reefs;leisure sports are unsuitable here.Thus,foreign matter and reefs should be removed,and the dry beach zone should be supplemented with sand.Therefore,the beach quality assessment is a very useful tool for building beautiful beaches.
文摘江苏如东县洋口港地区普遍发育末次冰盛期(MIS 2)"第一硬粘土层"。全新世早期,该区暴露侵蚀,仅局部地区发育潮汐水道。全新世中期(7 000 a B.P.)以来,在最大海侵作用影响下,研究区大部分地区以潮坪沉积为主;高海平面时期(5 220 a B.P.),研究区大部分地区处于水下沉积环境;随着海平面下降,北部地区发育古潮成砂体,属于滨海潮坪—潮成砂脊沉积体系。根据地层沉积特征,识别出4期埋藏古潮成砂脊。地层AMS14C年龄表明,4期砂脊是依次在5 220～1 000 a B.P.沉积形成的,反映了潮汐动力作用下古潮成砂脊的动态演化过程。
