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为科学配置我国无居民海岛资源,促进无居民海岛的开发利用与保护,文章基于无居民海岛的自然属性,研究无居民海岛的等别划分。研究结果表明:对于可开发利用的无居民海岛,以充分体现海岛价值、定性和定量相结合以及具有导向性、客观性和可操作性为原则划分等别;遴选权益价值、生态价值和资源价值3类要素及其14个指标,构建无居民海岛等别划分指标体系;除直接定性划分为禁止开发利用等别和最高等别的无居民海岛外,依据海岛的面积、离岸距离、植被和沙滩情况,将无居民海岛划分为6个等别。基于自然属性的无居民海岛等别划分指标体系更具科学性和实用性。 相似文献
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通过对黑河水库左坝肩特殊的岩体组成及结构进行分析研究，以断层破碎带为主要研究对象，结合实验研究并运用有限元等计算方法，对单薄山梁的渗透变形及稳定性进行分析与计算，为实际工程的决策与治理提供理论依据。 相似文献
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我国正处于工业化、城镇化进程加快的时期,能源消费强度较高。随着经济规模进一步扩大,我国能源需求持续增长对能源供给形成很大压力,石油天然气对外依存度将进一步提高。我国石油天然气资源相对不足,但能源勘探技术相对落后加剧了能源供给能力的提高,不少国际石油公司借助技术优势以合作开发的形式参与我国油气资源开发。虽然海洋油气资源的合作开发模式表面看起来实现了双方的共赢,但海洋油气资源的合作开发具有诸多潜在的危害性。 相似文献
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The concentration of suspended load can be determined by its linear relationship to turbidity. Our results present the basic
distribution of suspended load in North Yellow Sea. In summer, the suspended load concentration is high along the coast and
low in the center of the sea. There are four regions of high concentration in the surface layer: Penglai and Chengshantou
along the north of the Shandong Peninsula, and the coastal areas of Lüshun and Changshan Islands. There is a 2 mg/L contour
at 124°E that separates the North Yellow Sea from regions of lower concentrations in the open sea to the west. And there is
a 2 mg/L contour at 124°E that separates the North Yellow Sea from regions of lower concentrations in the open sea to the
west. The distribution features in the 10 m and bottom layer are similar to the surface layer, however, the suspended load
concentration declines in the 10 m layer while it increases in the bottom layer. And in the bottom layer there is a low suspended
load concentration water mass at the region south of 38°N and east of 123°E extending to the southeast. In general, the lowest
suspended load concentration in a vertical profile is at a depth of 10 to 20 m, the highest suspended load concentration is
in the bottom near Chengshantou area.
In winter, the distribution of suspended load is similar to summer, but the average concentrations are three times higher.
There are two tongue-shaped high suspended load concentration belt, one occurring from surface to seafloor, extends to the
north near Chengshantou and the other invades north to south along the east margin of Dalian Bay. They separate the low suspended
load concentration water masses in the center of North Yellow Sea into east and west parts. Vertical distribution is quite
uniform in the whole North Yellow Sea because of the cooling effect and strong northeast winds. The distribution of suspended
load has a very close relationship to the current circulation and wind-induced waves in the North Yellow Sea. Because of this,
we have been able to show for the first time that the distribution of suspended load can be used to identify water masses. 相似文献
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本文总结和归纳了已有的台风海面风场模式，按照风场模式物理背景的不同进行了分类．在此基础上，本文选择并建立了一种新的台风海面风场动力诊断模式．首先，利用台风影响范围内某条具有代表性的闭合等压线的拟合方程表示出台风海面气压场，并利用改进的气压场模式和修正的梯度风方程求得台风系统风场，同时还利用宫崎正卫的热带气旋合成风假设建立移行台风风场．然后将两者作权重订正后进行迭加，即得到台风模型风场．该模式考虑了包括台风气压场的非对称性、边界层摩擦效用、气压梯度的切向变化及台风中心移动的影响等多种因素．经过对0519号“龙王”台风的模拟，结果表明本文所建立的台风风场模式可以比较准确的模拟出非圆对称的台风海面气压场和海面风场，较为真实地反映实际台风风场的特征． 相似文献
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