| Popis: |
Windblown sand control in coastal areas of China began in the 1950s, but was restricted to coastal afforestation 500 to 1000 m landward from the storm-tide line (the maximum height reached by waves during a powerful storm); there were no studies of the supratidal and intertidal areas, where mobile sands create windblown sand damage problems. We therefore studied the formation conditions, characteristics, and damage mechanisms for aeolian sand activity in these areas. Based on the results, we propose suitable sand control measures that combine blocking of the moving sand with stabilization, initially using engineering measures then concluding with biological measures. Control measures include establishing dikes in the intertidal area, erecting nylon nets, and planting Cynodon dactylon behind the dikes on gentle sandy slopes above the high-tide line and below the storm-tide line; spraying sand stabilizer on steep slopes beside moving sand and erecting sand fences on both sides; and spreading mulch nets and mixing clay into the surface, thereby creating a comprehensive protective system that functions as a breakwater, and blocks and stabilizes sand. This protected installations along the beach and improved the ecological environment, leading to the establishment of mangrove seedlings that also stabilized beach areas. These results fill a large gap in the research on controlling windblown sand damage in China's coastal dune areas, and will have significant implications for controlling such areas in other climatic areas. |
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