The effect of contrasting threat mitigation objectives on spatial conservation priorities     

《Marine Policy》2016

The primary role of marine protected areas (MPAs) is marine conservation, however policy and practice around MPAs have not reflected this. The focus on cost-effectiveness by spatial conservation prioritization has led to a bias towards placing MPAs in areas that are least threatened. This study investigates how conservation priorities differ between two management strategies of either targeting or avoiding high threat areas for protection, using the case of the Sulu Sulawesi Seas in the Coral Triangle. For both strategies, the target of protecting 20% of habitat could not be achieved solely by protecting low threat areas. A high proportion of the region had large differences in conservation outcomes between the two strategies; majority of these areas were highly prioritized in the threat avoidance strategy but had low or zero importance in the threat selection strategy. Selecting for highly threatened areas required less habitat area to be protected to achieve the same conservation target and resulted in a more equitable distribution of priority sites per country and sub-region. This demonstrates the importance of deciding on the objectives of conservation and management policies up-front. The results suggest that, contrary to the common practice of avoiding threats in spatial planning, a threat selection strategy should be part of the management toolbox, particularly in transboundary planning for regions with high overall threat levels, where it may be important to achieve shared conservation targets equitably.  相似文献   

GYL-200型塔架履带一体式钻机的研制          下载免费PDF全文

肖燕波  张双临  朱慧  陈敏  戴圣海  彭儒金  李勇前 《探矿工程》2016,43(5):59-62

为提高钻机搬迁的方便性,简化竖塔过程,提高施工效率,研制了一种将后移式工勘钻机置于橡胶履带底盘上,并设计了液压起降折叠开放式三角钻塔的塔架履带一体式钻机。同时为不影响钻机原有的斜孔钻进功能,钻机底架设计为旋转支腿结构;为进一步提高钻机的自动化程度,将原手动式卡盘改为液压卡盘。介绍了该塔架履带一体式钻机的结构以及部分参数选择计算。  相似文献   

三角形网络和判据图法在地质灾害气象预警中的应用     

王正维  陈迎辉  楚国华 《中国地质灾害与防治学报》2010,21(1):98-103

本文以改进的综合判据图法为理论依据,提出了应用判据计算预警结果的权重系数和预警指数的预警方法,通过应用Delaunay三角网和边界条件限定自动剖分三角网进行地质灾害气象预警,实现了地质灾害气象预警自动计算、判别的新方法,建立了一套地质灾害气象预警自动计算软件系统,并应用于张家口市2007～2008年地质灾害气象预警,取得了一定的成果。  相似文献   

一井定向在立井联系测量中的应用     

卜晔 《四川地质学报》2010,30(1):115-117

详细介绍了在立井平面联系测量中连接三角形法一井定向的测量和解算方法,特别提出了不同连接三角形解算适用不同的计算公式。并结合实践经验,阐述了一井定向连接三角形法和瞄直法的使用范围和测量注意事项。  相似文献   

平度市大庄子两竖井三角形联系测量精度分析     

杜圣芳  刘涛  刑宝石 《山东国土资源》2007,23(8):23-24,26

三角形联系测量是地面控制点数据引入井下、指导井下开矿的重要手段。鑫汇金矿、金兴金矿已于建矿时进行联系测量,现已开矿10余年。2005年5月,利用54北京坐标系、56黄海高程系建立地面控制网,分别对两竖井进行三角形联系测量及巷道导线测量。对两矿巷道顶板导线点起到检核作用,为处理井下越界开采提供法律依据。  相似文献