Data Repository Sand Banks SW North Sea

Sand banks in the SW North Sea are heavily influenced by the relationship between the critical shear stress of the sediment and the shear stress induced by the water motions. The data shows how the sand bank distribution is bounded to certain shear stress conditions. It appears that the ratio between the maximum bed shear stress and the critical shear stress of the surface sediments (simply referred to as shear stress ratio) has to exceed a threshold of nine to launch sand bank formation to a greater extend.
Previous prediction models have suggested that sand banks form when the shear stress of the water motions exceeds the critical shear stress of the sediment. Subsequently, these findings can improve further predictions of sand bank formation.

The dataset contains:

- Shear stress ratio as a tif-raster file
The shear force ratio was calculated using several raster datasets provided by the Helmholtz Centre of Geesthacht.

- Current induced shear stress / critical shear stress - ratio
Again, values were calculated using datasets from the Helmholtz Centre of Geesthacht.

- Sand bank shapefile

北海南部海域的沙脊显著受沉积物临界剪切应力与水流运动诱导剪切应力之间的耦合关系影响。本数据集揭示了沙脊分布如何受特定剪切应力条件的约束。研究表明，床面最大剪切应力与表层沉积物临界剪切应力之比（简称剪切应力比，shear stress ratio）需超过9这一阈值，才能更大程度地触发沙脊形成。

此前的预测模型曾提出，当水流运动产生的剪切应力超过沉积物临界剪切应力时，便会形成沙脊。本研究成果可进一步优化沙脊形成的预测精度。

本数据集包含以下内容：
- 剪切应力比TIFF栅格文件：该剪切力比通过盖尔斯特哈特亥姆霍兹研究中心（Helmholtz Centre of Geesthacht）提供的多套栅格数据集计算得到。
- 水流诱导剪切应力/临界剪切应力比：该比值同样通过盖尔斯特哈特亥姆霍兹研究中心提供的数据集计算得到。
- 沙脊Shapefile文件