原题
Coastal Erosion Solutions
Coastal erosion poses a significant threat to communities worldwide, especially in low-lying and densely populated coastal zones. This natural phenomenon causes the gradual wearing away of coastlines. Human activities such as construction, sand mining, and deforestation, along with sea level rise and increased storm intensity due to climate change, exacerbate the problem. Engineers and scientists are developing innovative solutions to combat this issue and protect vulnerable areas.
One popular method is beach nourishment, which involves adding sand to eroding beaches. This temporary solution can be costly and requires regular maintenance, but it helps to restore a beach's natural barrier against waves. Additionally, the installation of structures like groynes and seawalls offers another approach. Groynes are barriers built perpendicular to the coastline, trapping sand carried by longshore drift. Seawalls, on the other hand, are constructed parallel to the shore to protect the land from wave impact.
Apart from structural interventions, some approaches focus on ecological solutions. Living shorelines, for instance, use native vegetation to stabilize the coast. These natural buffers absorb wave energy, reducing erosion while providing habitats for marine life. Despite their ecological benefits, living shorelines can take time to establish and may not be suitable for all areas.
Why does the author discuss "groynes and seawalls" in the passage?
ATo demonstrate the effectiveness of solutions to coastal erosion
BTo identify some structural solutions to coastal erosion
CTo explain the significance of combating coastal erosion
DTo suggest that solutions to coastal erosion vary in construction and maintenance costs
正确答案：B
解题思路
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