Ecosystem service valuation of bays in East China Sea and its response to sea reclamation activities     

Liu  Ruiqing  Xu  Hao  Li  Jialin  Pu  Ruiliang  Sun  Chao  Cao  Luodan  Jiang  Yimei  Tian  Peng  Wang  Lijia  Gong  Hongbo 《地理学报(英文版)》2020,30(7):1095-1116

Journal of Geographical Sciences - Ecosystem service values (ESVs) of bays and their response to sea reclamation are of great practical importance for forming bay eco-compensation policy and...  相似文献   

环渤海地区化肥投入变化及其适宜性分析     

郭丽英  刘玉 《地域研究与开发》2011,30(3)

农田化肥投入过量导致资源浪费和环境污染问题,成为全球关注的焦点和热点.以环渤海地区为例,利用1989-2008年统计年鉴相关数据资料,分析了区域化肥投入的总量变化、区域变化和单位农作物播种面积变化的差异.通过建立农田化肥肥效指标,评价了环渤海地区及其分省(市)的化肥施用效率,研究提出了单位农作物播种面积的化肥施用适宜量,为实现合理施用化肥、提高化肥施用效率和保护农田生态环境提供了参考依据.  相似文献   

辽东湾地区古近系东营组二段沉积相特征     

段亮  徐国盛  李建平  周东红  郭永华 《物探化探计算技术》2011,33(5):549-554,465

以大量的地质、地球物理资料及前人研究成果为基础,运用沉积学原理和方法,详细地分析了辽东湾盆地东营组二段的沉积相特征。经分析认为,东营组二段虽整体为湖泊-三角洲沉积体系,但其下部与上部的沉积特征差异明显：下部以湖相环境为主,上部则主要为三角洲沉积。在综合了该区构造特征和水系发育特征后,编制了东二段下和东二段上的沉积相平面展布图,并指出,辽西低凸起北倾末端和辽中凹陷中南洼为最有利的勘探区带。  相似文献   

Spatial polychaeta habitat potential mapping using probabilistic models     

Jong-Kuk Choi  Hyun-Joo Oh  Bon Joo Koo  Joo-Hyung Ryu  Saro Lee 《Estuarine, Coastal and Shelf Science》2011

The purpose of this study was to apply probabilistic models to the mapping of the potential polychaeta habitat area in the Hwangdo tidal flat, Korea. Remote sensing techniques were used to construct spatial datasets of ecological environments and field observations were carried out to determine the distribution of macrobenthos. Habitat potential mapping was achieved for two polychaeta species, Prionospio japonica and Prionospio pulchra, and eight control factors relating to the tidal macrobenthos distribution were selected. These included the intertidal digital elevation model (DEM), slope, aspect, tidal exposure duration, distance from tidal channels, tidal channel density, spectral reflectance of the near infrared (NIR) bands and surface sedimentary facies from satellite imagery. The spatial relationships between the polychaeta species and each control factor were calculated using a frequency ratio and weights-of-evidence combined with geographic information system (GIS) data. The species were randomly divided into a training set (70%) to analyze habitat potential using frequency ratio and weights-of-evidence, and a test set (30%) to verify the predicted habitat potential map. The relationships were overlaid to produce a habitat potential map with a polychaeta habitat potential (PHP) index value. These maps were verified by comparing them to surveyed habitat locations such as the verification data set. For the verification results, the frequency ratio model showed prediction accuracies of 77.71% and 74.87% for P. japonica and P. pulchra, respectively, while those for the weights-of-evidence model were 64.05% and 62.95%. Thus, the frequency ratio model provided a more accurate prediction than the weights-of-evidence model. Our data demonstrate that the frequency ratio and weights-of-evidence models based upon GIS analysis are effective for generating habitat potential maps of polychaeta species in a tidal flat. The results of this study can be applied towards conservation and management initiatives for the macrofauna of tidal flats.  相似文献   

Study on headland-bay sandy coast stability in South China coasts   总被引：1，自引：0，他引：1  

于吉涛  陈子燊 《中国海洋工程》2011,25(1):1-13

Headland-bay beach equilibrium planform has been a crucial problem abroad to long-term sandy beach evolution and stabilization,extensively applied to forecast long-term coastal erosion evolvement and the influences of coastal engineering as well as long-term coastal management and protection.However,little concern focuses on this in China.The parabolic relationship is the most widely used empirical relationship for determining the static equilibrium shape of headland-bay beaches.This paper utilizes the relation to predict and classify 31 headland-bay beaches and concludes that these bays cannot achieve the ultimate static equilibrium planform in South China.The empirical bay equation can morphologically estimate beach stabilization state,but it is just a referential predictable means and is difficult to evaluate headland-bay shoreline movements in years and decades.By using Digital Shoreline Analysis System suggested by USGS,the rates of shoreline recession and accretion of these different headland-bay beaches are quantitatively calculated from 1990 to 2000.The conclusions of this paper include that (a) most of these 31 bays maintain relatively stable and the rates of erosion and accretion are relatively large with the impact of man-made constructions on estuarine within these bays from 1990 to 2000;(b) two bays,Haimen Bay and Hailingshan Bay,originally in the quasi-static equilibrium planform determined by the parabolic bay shape equation,have been unstable by the influence of coastal engineering;and (c) these 31 bays have different recession and accretion characters occurring in some bays and some segments.On the one hand,some bays totally exhibit accretion,but some bays show erosion on the whole.Shanwei Bay,Houmen Bay,Pinghai Bay and Yazhou Bay have the similar planforms,characterized by less accretion on the sheltering segment and bigger accretion on the transitional and tangential segments.On the other hand,different segments of some bays have two dissimilar evolvement characters.Dacheng Bay,Shenquan Bay,Hudong Bay,Wukan Bay,Fengjia Bay,Wuchang Bay,Lingshui Bay and Tufu Bay produce accretion on the tangential segment,erosion on the transitional segment and accretion on the sheltering segment.However,Guang’ao Bay,Haimen Bay,Jinghai Bay,Sanya Bay(a),Dajiao Bay,Hailingshan Bay,Hebei Bay,Fuhu Bay,Shuidong Bay,Wangcun Bay and Bomao Bay generate erosion on the tangential part,accretion on the transitional part and accretion on the sheltering part.It seems to imply some relations between headland-bay beach evolvement and controls on headland-bay beaches,which may possibly to classify headland-bay beach types and should be further studied.  相似文献   

海湾围填海适宜性评估与示范研究     

刘大海  陈小英  陈勇  林河山 《海岸工程》2011,30(3):74-81

基于环境经济学和统计学的基础理论和评估方法,确定了船舶工业用海、港口用海、旅游娱乐用海、其它工业用海等重点用海行业,构建了适用于我国海湾的围填海适宜性评价体系,具体包括海岸、动力、冲淤、生物和水质等5个方面适宜性条件指标;在此基础上,测算确定了我国海湾围填海的区位适宜性参数和资源环境适宜性参数;最后,以海州湾北侧为例进...  相似文献   

海岸带修复地形变形监测探讨——以北海市廉州湾东岸整治修复为例     

王增军  梁燕燕  韦江玲  张春华  魏春雷 《测绘与空间地理信息》2017,40(11)

为了解廉州湾东岸海滩修复前后海岸地形的变化规律,本文以分析沙滩测量特性为前提,对修复沙滩特定剖面进行变形监测;并运用高程-距离绘制剖面图,同时对潮下带进行水下地形测量;应用GIS建立DEM,对比等高线,还重点分析了台风对沙滩地形的影响。结果表明,修复沙滩经过2年的时间,海岸线向陆域方向移动,滩肩变窄;0 m等高线向海方向移动20 m,-0.5 m等高线向海方向移动30 m;台风对沙滩的侵蚀是直接性的,且形成垂直断面;台风过后经历0.5年时间沙滩基本处于平衡状态。  相似文献   

用GPS监测杭州湾跨海大桥沉降的可行性分析     

宋超  郝金明 《测绘科学》2013,38(4):26-27

杭州湾跨海大桥建成通车后,原有的利用水准测量进行沉降监测的方式遇到了很大困难。针对这种情况,本文从理论上推导了使用GPS静态测量代替水准测量进行沉降监测带来的差别,并通过数值分析证明了对于杭州湾跨海大桥这种差别在1mm以内。最后对两者的实际测量精度情况进行了分析,得出两者在杭州湾跨海大桥沉降监测中测量精度相当。  相似文献   

Tectonic Characteristics and Evolution of Bohai Bay Basin, China     

LIU Pengju  ZHANG Meisheng  SUN Xiaomeng  YANG Baojun 《东北亚地学研究》2002,(2)

ＴｈｅＢｏｈａｉｂａｙｂａｓｉｎ ,ｌｏｃａｔｅｄｉｎｅａｓｔｒｅｎＣｈｉｎａ ,ｉｓｃｏｎｓｉｄｅｒｅｄａｓａｂｉｇＣｅｎｏｚｏｉｃｃｏｎｔｉｎｅｎｔａｌｒｉｆｔｂａｓｉｎ .Ｔｈｅｂａｓｉｎｐｏｓｓｅｓｓｅｓｄｅｅｐｅｒｆａｕｌｔ -ｔｒｏｕｔｈ ,ｇｏｏｄｃｏｎｓｉｓｔｅｎｃｙａｎｄｈｕｇｅｐｅｒｓｐｅｃｔｉｖｅｆｏｒｐｅｔｒｏｌｅｕｍａｎｄｎａｔｕｒａｌｇａｓｅｘ ｐｌｏｉｔａｔｉｏｎｉｎＰａｌａｅｏｇｅｎｅａｎｄｐｒｅ -Ｐａｌａｅｏｇｅｎｅｓｙｓｔｅｍｓ .Ｔｈｅｓｔｕｄｙｏｎｔｅｃｔｏｎｉｃｃｈ…  相似文献   

禁用后有机农药六六六在胶州湾海域的含量年份变化     

陈豫  艾鸿  赵慧娟  杨丹枫  杨东方 《海洋科学》2015,39(12):112-117

根据1985~1989年的胶州湾水域调查资料,分析有机农药HCH在胶州湾水域的含量大小、年份变化和季节变化。研究结果表明:在1985~1989年期间,水体中HCH的含量全部低于一类海水的水质标准,保持着一类海水水质。在HCH含量方面,在胶州湾整个水域,水质非常的清洁。HCH在胶州湾水体中的含量是很低的0.2095μg/L,就出现了胶州湾水体中HCH含量在年份的变化是振荡的变化,其变化范围为:0.002~0.2095μg/L。而且在一年中季节变化就没有了。然而,水体中HCH的低含量却是长期存在的,很难从环境中消失。  相似文献