Coastal erosion is a global issue that not only compresses land space but also undermines offshore structures. In this study, two eco-friendly technologies (microbially and enzyme induced calcium carbonate precipitation) were implemented at a sandy slope field site to enhance erosion resistance. Improvement of the treated sandy slope against erosion was assessed by penetration resistance, calcium carbonate content, cone penetration testing (CPT) results, terrain data and microscopic morphology. Results indicated that the penetration resistance and calcium carbonate content of treated slopes increased first and then decreased over time because of the gradual formation of calcium carbonate and the erosion caused by the marine environment. Calcium carbonate content and penetration resistance presents an obvious linear relationship. The existence of the superficial cemented crust layer increased the water retention capacity of the sand in the atmosphere region. The calcium carbonate content and CPT results in the tidal region shows the characteristics of layered cement. The spherical calcium carbonate cementation improves the roughness and integrity of the terrain, enhances the particle size of the sand, gradually changing the topography from pre-treatment dynamic erosion to depositional patterns. The treated slope still maintained a certain penetration resistance and calcium carbonate content for 60 days until being eroded by the wind in the atmosphere region. However, the effective protection duration in the tidal zone which encounters wind, wave, tide and reflow was about 24 days, and would thus need to be reinforced periodically over time to obtain long-term protection.

中文翻译：

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生态友好型抵御沙坡海岸侵蚀的现场实施

海岸侵蚀是一个全球性问题，不仅压缩陆地空间，还破坏近海结构。在这项研究中，在沙坡现场实施了两种环保技术（微生物和酶诱导碳酸钙沉淀），以增强抗侵蚀能力。通过渗透阻力、碳酸钙含量、锥入试验（CPT）结果、地形数据和微观形态来评估处理后的沙质斜坡抗侵蚀的改善情况。结果表明，由于碳酸钙的逐渐形成和海洋环境的侵蚀，处理过的边坡的渗透阻力和碳酸钙含量随着时间的推移先增加后减少。碳酸钙含量与渗透阻力呈现明显的线性关系。浅表胶结壳层的存在增加了大气区沙子的保水能力。潮汐区碳酸钙含量和CPT结果显示出层状水泥的特征。球形碳酸钙胶结作用改善了地形的粗糙度和完整性，增大了砂粒的粒径，使地貌逐渐从处理前的动态侵蚀转变为沉积形态。处理后的边坡在60天内仍保持一定的渗透阻力和碳酸钙含量，直至受到大气区风的侵蚀。但在遭受风、浪、潮、回流等影响的潮汐带，有效防护时间约为24天，需要定期加固，才能获得长期防护。