基于TIN模型的海底面积计算及底栖生物量评估

Research and Application of Seabed Surface Area Based on TIN Data Model

海底资源的分布格局通常依托于海底地形表面,在计算其面积时,一般计算其投影面积,然而这种计算方法并不能真实反映海底地形特征,针对于此问题,本文围绕海底TIN数据模型构建方法,从技术流程上进行了探讨和研究,最终生成TIN数据模型,计算其表面积,并以棉花岛海域为例,比较其在投影面积和表面积情形下底栖生物的分布。从比较结果可以看出,二者在底栖生物分布数量和经济补偿金额上存在明显差异。采用表面积方法更能真实反映海底地形分布特征,这对准确评估所覆被生物资源量、生态系统储量及定量评价具有一定的探索意义。

The distribution pattern of seafloor resources is usually affected by the seabed surface terrains.When calculating the area of seabed,one mainly considers projection area.However,the calculated result by using this method cannot accurately reflect the submarine topography characteristics.In order to solve this problem,this paper discussed and analyzed the building method of seabed TIN data model,and built a TIN data model to calculate the surface area.Taking the Mianhua Island as an example,this paper compared the distribution pattern of bentonic organism under the projected area and surface area,respectively.The results showed that both distribution population and economic compensation amount calculated by the two abovementioned methods were obviously different.Compared to the projected area method,the data obtained by using surface area method can reflect the distribution characteristics of submarine topography more accurately,which has some exploring significance for the accurate assessment of covered biological resource volume,ecosystem reserves and quantitative evaluation.