威海市海岸带地质环境承载力综合评价研究

Study on Geological Environment Carrying Capacity in Coastal Zones in Weihai City

该文在威海市海岸带综合地质调查项目的基础上,根据陆域和海域不同的地质环境条件,分别进行了地质环境承载力综合评价。陆域选取了3个一级评价因子和13个二级评价因子建立地质环境承载力评价指标体系,利用层次分析法取得各评价因子权重,再利用模糊数学综合指数法进行了综合评价。海域选取了海底沉积物重金属污染、海底沙坡沙脊、浅层气、浅埋基岩和埋藏下切谷等5个评价因子,采用叠加法进行了综合评价。最终,将研究区地质环境承载力划分为强区、较强区、一般区、较弱区等4类。研究区陆域地质环境承载力相对较强,占总面积的67.67%;其次为一般区,占总面积的31.67%;较弱区零星分布,仅占总面积的0.66%。近海地质环境承载力总体较强,一般区主要分布在威海湾西部,较弱区分布在威海湾以北的广阔海域。

On the basis of comprehensive geological survey projects in coastal areas in Weihai city, according to different geological environmental conditions of land and waters, comprehensive evaluation of geological environ-ment carrying capacity has been carried out respectively. Selecting three first level evaluation factors in land region and 13 secondary evaluation factors,geological environment carrying capacity evaluation index system has been set up. The evaluation index weights have been obtained by using the level analytic method. Then the fuzzy mathematics comprehensive index method is used for comprehensive evaluation. Selecting five evaluation factors in sea region, such as the seabed sediments of heavy metal pollution,underwater sand slope and sand ridge,shallow gas,shallow buried bedrock and incised valley,by using the superposition method,comprehensive evaluation has been carried out. Carrying capacity of geological environment in the study area is divided into strong area, rather strong area, general area and weak area. Carrying capacity of geological environment in land area in the study area is relatively strong,and accounting for 67.67% of the total area; general area can account for 31.67% of the total area; weak area distributed scatterly and accounted for only 0.66% of the total area. Carrying capacity of geological environment in the offshore area is overall strongt. The general areas mainly distributed in the western Weihai Bay,and rather weak region distributed the vast area in northern Weihai Bay.