英国兰卡斯特大学dissertation部分范文(Lancaster University)：海上防御如何影响机场建设？
Waves
波浪
The wave data recorded by ship-borne recorders from 1965 to 1968 in an area about 30km from the coast of Sheppey, where the sea floor was 12.1m deep, showed that the average wave height as 0.41m above the sea level and the maximum wave as 1.68m above the sea level. The maximum wave near the coastline was calculated using the measured sea level and the predicted tide, which is also called ‘extreme surge’. The extreme surge recorded at the tidal gauge station in Sheerness from (1990-2010) shows the maximum height of the surge is 2.95m and the average height is 0.86 m.
1965年至1968年由舰载录像机面积从谢佩海底深12.1米的海岸约30公里的波数据记录，结果显示，平均波高海拔和最大波0.41米为海拔1.68米。
Flooding could be caused when a storm surge occurs near a high tide. Estimation of the change to storm surges and the extreme water levels over the next 100 years has been made in the UKCP09 document; for the Isle http://ukthesis.org/Thesis_Writing/Accounting_Assignment/Engineering/ of Sheppey coastal area, the model projection results show only a small change with a great deal of uncertainty. As such this change of storm surge level over the next 100 years will not be used in the design process. (32)
洪水发生风暴潮时，可能是由于附近一个高潮。估计风暴潮的变化，在未来100年极端水位已取得的UKCP09文件;
Relevance to construction
相关建设
By considering the extreme level of surge and sea level rise, the reclaimed land is planned to be a minimum of 5m above the mean sea level after full settlement occurred. Settlement and initial island height estimates are to be designed separately.
考虑潮和海平面上升，极端水平，填海所得的土地规划为5m以上的最低平均海平面发生后全数清偿。结算和初始岛屿的高度估计是单独设计。
Existing sea defenses
现有的海上防御
Due to the location and geographical features of the Isle of Sheppey, many area near the coastline are in the intertidal zone – shown in Figure 26 - and many others at a high risk of flooding.
由于谢佩岛的位置和地理特征，许多地区的海岸线附近的潮间带 - 如图26所示 - 和许多其他人在一个较高的水浸风险。
Current sea defenses around the Isle of Sheppey consist of a variety of structures. From West to East:
目前谢佩岛附近的海上防御包括各种结构。从西到东：
• seawalls, revetments, groynes and recharge along Sheerness coast
• shingle embankments for protecting the Minster Marshes,
• seawalls, revetments and groynes at Minster;
• seawalls, revetments and groynes throughout Warden Bay;
• embankments towards Shell Ness;
• saltings and sand/shingle banks in Swale Estuary
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Figure 26
The Isle of Sheppey Strategy (initiated in 1998) was included in the coastal strategy developed by SECG (South East Coastal Group). It recommends improving the existing defences around the Northern and Western coasts, with further consideration for the Southern defences. However, no protection is deemed necessary around the cliff areas and from Minster to Warden Point. This plan for the future is shown in Figure 27.
Figure 27
Erosion
侵蚀
In 2005 the National Trust published research on the shifting of the coastline and its long-term future, considering the impact of erosion, flooding & sea level rise. However, the publication only indicates the ten coastlines in its care which face the highest risk of changing coastline; it does not include detailed results which can be adopted to assess the situation of our proposed site. Other studies have followed, such as on the South West England in 2008, by the National Trust, and detailed data on coastal erosion also can be obtained from IECS research in 1994 the North East of England. However it seems not much detailed data about the erosion in the Thames Estuary is readily available.
其他研究也紧随其后，如2008年在英格兰西南部，由国家信托，海岸侵蚀的详细数据也可以IECS研究获得1994年英格兰东北部。然而，它似乎没有太多详细的数据在泰晤士河河口侵蚀更是一应俱全。
However, we must still conclude erosion is a risk to the new platform, and that construction of a breakwater may be required to protect the reclaimed land and runways from reducing the incident wave energy. Because the breakwaters are sited further out to the sea, they will be in an area with deeper water, where the attenuation by friction of sedimentation is less and the wave energy is higher than in reclaimed land. The breakwaters need to be design as enough tough to resist the full force of the waves. Without the full assessment for their location, the breakwaters can generate a negative effect on the reclaimed land (such as when an insufficient single breakwater generates the formation of a tombolo profile. For the common segmented breakwater, the ratio of the gap width to structure length and the ratio to distance from shore control the degree of effectiveness (35). Therefore careful investigations must be carried out in considering the construction of these protective measures.
然而，我们仍然必须断定糜烂是一种新平台的风险，减少入射光波的能量，可能会被要求保护的填海土地和跑道，建设防波堤。
