地质环境安全评价

地质环境安全评价是国土空间规划的基础性工作.其目的是对人类生命财产、城镇和工程建设构成威胁的地质环境问题进行评价.基于人类生命安全至上和灾害链综合风险的原则，选取区域地壳稳定性、突发地质灾害易发程度和地面沉降易发程度等制约国土空间规划的“短板”要素，以全国为例，采用基于灾害链综合评价的图形叠置法开展地质环境安全综合评价，将地质环境安全程度分为5个等级.地质环境安全程度由高到低所占面积分别为28.34%、29.36%、21.00%、4.51%和4.24%.评价结果宏观反映了地质环境条件和安全程度，揭示了区域分异特征，能够从地质环境安全角度为国土空间规划，特别是城镇和工程建设选址综合安全评价和用途管制等工作提供科学参考依据. 

Geological Environment Safety Evaluation

The geological environment safety evaluation is becoming increasingly more important in land planning since the geological environment is getting more complicated in recent years. Based on summarizing the previous comprehensive evaluation of geological environment, a comprehensive evaluation index system of geological environment safety is established and a comprehensive evaluation method thereof is developed to provide scientific basis and technical support for land planning and evaluation of resources and environment carrying capacity. The connotation of geological environment safety is put forward, and three key factors for geological environmental safety evaluation are determined as regional crust stability, susceptibility of geologic hazards, and susceptibility of chronic geologic hazards, which are evaluated respectively. Five grades and twelve classes are divided through comprehensive evaluation of geological environment safety by using a comprehensive way to evaluate the dominant factors. The evaluation results not only reflect the degree of geological environment safety, but also explain the key factors affecting the geological environment safety. The area of overlapping regions, where the regional structure is extremely unstable and unexpected geological hazards are especially easy to occur, accounts for about 4.24%, mainly distributed in the eastern margin of the Tibetan plateau, mainly involving Gansu Baiyin-Tianshui, Sichuan Deyang-Kangding-Xichang, Yunnan Dongchuan-Gejiu, southern Tibet and western Yunnan areas. The results of geological environment safety evaluation enhance the understanding on geological environment, and the degree of geological environment safety, as one of the indicators of land planning, provides technical support and scientific basis for land planning.