回复: richmond是沙子堆积起来的吗?会不会危险啊?
要担心地震造成堤防破裂,适逢大潮造成海水倒灌。或地震引起的沙质冲积土液化现象,或因菲沙河水位爆涨引发下游未及排水而堵塞淹水。
http://www.earthquakescanada.nrcan.gc.ca/hazard-alea/zoning-zonage/NBCC2005maps-eng.php
截自WIKI Since all of Richmond occupies islands in a
river delta, the city has plenty of rich,
alluvial soil for agriculture, and was one of the first areas in British Columbia to be farmed by Europeans in the 19th century. The drawback of Richmond's geographical location, was that since all the land averages just one metre above
sea level, it was prone to flooding, especially during
high tide. As a result, all the major islands are now surrounded by a system of
dykes, which, although not as massive as those in the
Netherlands or the
levees of
New Orleans, serve to protect the town from anticipated sources of flooding. There is a possibility that, during an
earthquake, the dykes could rupture and the alluvial soil may
liquefy, causing extensive damage. Richmond is also at risk of a major flood if the
Fraser River has an unusually high spring
freshet.