摘要：Geographical design of riparian buffers with long-term vegetation cover for environmental restoration in agricultural watersheds needs to assess how much farmland is located in the buffers of a concerned watershed. Traditionally, this assessment was done by field surveying and manual mapping, which was a time-consuming and costly process for a large region. In this paper, remote sensing （RS） and geographical information system （GIS） as cost-effective techniques were used to develop a catchments-based approach for identifying critical sites of agricultural riparian buffer restoration. The method was explained through a case study of watershed with ll catchments and results showed that only four of the catchments were eligible in terms of higher priority for riparian buffer restoration. This research has methodological contributions to the spatial assessment of farming intensities in catchments-based riparian buffers across a watershed and to the geographical designs of variable buffering scenarios within catchments. The former makes the catchments-based management strategy possible, and the latter provides alternative restoration scenarios to meet different management purposes, both of which have direct implementations to the environmental restoration of riparian buffers in the real world. This study, thus, highlights the great potential of RS and GIS applications to the planning and management of riparian buffer restoration in agricultural watersheds.

摘要：目的对高黏乳化沥青砂封层的配合比设计进行研究,使高黏乳化沥青砂封层技术广泛地应用到实际工程中.方法先制备6种不同固含量和恩格拉黏度的乳化沥青样品,再利用Meclod法计算出乳化沥青和机制砂的理论洒布量并根据试验确定机制砂的单一级配粒径.通过脱石率试验、抗滑性能试验、砂封层渗水性能等试验对理论洒布量进行调整,综合试验所得结果和实际施工中的相关影响因素.结果高黏乳化沥青砂封层的配合比宜选用固含量为70%,恩格拉黏度为10的乳化沥青样品,洒布量为1.1 kg/m2,机制砂选用2.36~4.75 mm单一粒径集料,洒布量宜为6.7 kg/m2.结论通过试验最终得到了高黏乳化沥青砂封层的最佳配合比,为工程实践研究提供了理论数据.