海岸趋势面应用技术比较分析

依据黄河三角洲潮滩海岸准同步断面实测地形点数据，进行地貌趋势面的多种技术方法处理。多项式回归方法能把握潮滩海岸三维形态的总趋势，忽略全部次一级形态特征；NearestNeighbor方法、Kriging方法和Triangulation W/线性插值方法均可以显示总趋势面上次一级形态——潮滩海岸沟盆体系。其中Triangulation W/线性插值法计算出的局部特征十分明显，但边界会产生很大误差。Kriging方法和NearestNeighbor方法在边界上处理得较好，Kriging方法图象过渡得非常自然，而Nearest Neighbor方法相对保留了矩形的处理特征。趋势面分析表明，潮沟—潮盆体系的形成与发展是表征黄河三角洲潮滩海岸时空谱系发育进程的重要指标。

The Comparison Analysis of the Trend Surface Application on the Coast ——Taking the Yellow Rive r Delta as an Example

Reported mainly in this paper are four analytic techniques ofgeomorphologic trend surface based on quasi-synchronously observed 3 dimensional topographic data on the Yellow River Dalta coast. The Polynomical Regression method can well reflect the general trend of the 3 dimensional form of the tidal flat coast, neglecting the secondary chromatography features; While the Nearest Neighbor Method, Kriging Method and Triangulation with Linear Interpolat ion Method can all show the second grade geomorphologic forms—the creeks-basin system on tidal flat coast. Among them, the calculation result by Triangulation with the Linear Interpolation Method represents the apparent local features, but it has relatively more error at the boundary. The kriging Method and Nearest Neighbor Method do well at the boundary. The image calcuated from the Kriging Method has a smooth transition; the Nearest Neighbor Method keeps the rectangular processing features. The analysis of trend surface demonstrates that the appearances of tidal creeks-drainage basin systems are an important indication of the development of the temporal-spatial spectra on the tidal flat coast of the Yellow River Delta.