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首页> 外文会议>Proceedings of the Twenty-eighth Arctic and Marine Oilspill Program(AMOP) Technical Seminar vol.1 >Time Series Observations of Marsh Recovery and Pavement Persistence at Three Metula Spill Sites after 30(1/2) Years
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Time Series Observations of Marsh Recovery and Pavement Persistence at Three Metula Spill Sites after 30(1/2) Years

机译：30（1/2）年后三个et漏地点的沼泽恢复和路面持久性的时间序列观察

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摘要

Field visits to coastal sites oiled from the 1974 Metula spill in the Strait of Magellan, Chile, were conducted 30(1/2) years after the incident. The 2005 survey repeated observations and measurements made in 1998 in the Punta Espora area that documented salt marsh recovery at two sites and changes in an asphalt pavement at a third site. The Puerto Espora east marsh was one of the most heavily oiled of all coastal sites in 1974. Plant recolonization has been slow and the marsh is still oil covered and bare of vegetation in most sections. Comparison of plant count data between 1998 and 2005 indicate that the number of plants in one large block (210 m~2) doubled, whereas, the number of plants in the other large block (260 m~2) increased almost five-fold. Observations in 1998 on a set of 12 small (1m~2) 1993 treatment test plots indicated that tilling had resulted in a substantial increase in the number of plants that were able to recolonize the plots. A comparison of the plant counts on these plots between 1998 and 2005 showed that the number of plants in the tilled plots was reduced due to dominance by a fewer number of larger plants. Both the size of the individual plants and the area coverage actually increased. Oil distribution in the west marsh was widespread and a comparison of 1998 and 2005 showed that recolonization was evident as the Sarcocornia sp. had spread over the oil. A large, 550 m-long, continuous, asphalt pavement that had formed on a mixed-sediment beach (sand, pebbles, and cobbles) remained at Punta Espora. Photography over the period 1977 through 2005 showed relatively little change in the pavement area. Measurable changes occurred to the pavement upper edge to a maximum of 60 cm, between 1998 and 2005, due to erosion by backwash action of waves during high-tide water levels.
机译：事件发生后30（1/2）年，对从1974年Metula溢油在智利麦哲伦海峡上油的沿海地区进行了实地考察。 2005年的调查重复了1998年在蓬塔埃斯波拉地区所做的观察和测量，记录了两个地点的盐沼恢复情况以及第三地点的沥青路面变化情况。 1974年，埃斯波拉港东沼泽是所有沿海地区中油料最重的地区之一。植物重新定植的速度很慢，而且大部分地区的沼泽仍被油覆盖，没有植被。 1998年和2005年植物计数数据的比较表明，一个大区块（210 m〜2）中的植物数量增加了一倍，而另一个大区块（260 m〜2）中的植物数量几乎增加了五倍。 1998年对一组12个小的（1m〜2）1993年处理试验样地进行的观察表明，耕种已使能够重新定殖的植物数量大大增加。对1998年至2005年这些地块上植物数量的比较表明，由于占主导地位的耕种地块中的植物数量减少，而大型植物的数量减少了。单个植物的大小和面积覆盖率实际上都在增加。西沼泽地的石油分布很广泛，1998年和2005年的比较表明，Sarcocornia sp。的确是重新定殖。散布在油上。蓬塔埃斯波拉（Punta Espora）仍然有一个长550 m的连续沥青路面，形成于混合沉积物的海滩上（沙，卵石和鹅卵石）。从1977年到2005年的摄影显示，人行道区域的变化相对较小。在1998年至2005年之间，由于潮汐水位高时波浪的反冲作用造成的侵蚀，路面的上边缘最大可测量变化为60 cm。

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