Mean Power Density (W/sq.m) - Eastern Cape

Purpose:
This data set was created for the WASA project and the Department of Energy, South Africa. The wind resource maps were designed specifically for inclusion in GIS-based strategic environmental assessments (SEA) for wind power in Western Cape and parts of Northern and Eastern Cape.

Methodology:
Reference is made to the information and documentation available from www.wasaproject.info and www.wasa.csir.co.za.

Limitations:
The data set is limited by the operational envelopes of the wind atlas methodology and the WAsP models. The accuracy depends on a) the accuracy of the VNWA, which has been verified against the data from 10 WASA measurement masts, b) the WAsP microscale modelling and c) the input topographical data.

In complex terrain (RIX > 5%), the wind resources may be significantly over-estimated by the WAsP microscale modelling. Above and close to built-up areas like cities, towns and villages, the results are less reliable. Close to and above forested areas, the results are also less reliable and should be interpreted and used accordingly.

The data set was designed specifically for planning purposes and should be used with utmost care for design, development and detailed assessments of actual wind farms; where local, on-site measurements are strongly recommended. The wind resource maps are subject to change without notice if and when more accurate and reliable data, models and procedures become available.

Available documentation:
The wind atlas methodology is described in the European Wind Atlas (1989); the application of WAsP in the program documentation, see www.wasp.dk. The Verified Numerical Wind Atlas for South Africa is a product of the Wind Atlas for South Africa project and is described further on the WASA download pages http://wasadata.csir.co.za/wasa1/WASAData.

Acknowledgements:
WASA project for Frogfoot application and provision of wind-climatological and topographical data. WAsP development teams at DTU Wind Energy and World in a Box Oy for Frogfoot development.

数据集用途：本数据集系为南非能源部及WASA项目定制开发，其风能资源图谱专为西开普省、北开普省及东开普省部分区域的风电地理信息系统（Geographic Information System, GIS）战略环境评估（Strategic Environmental Assessment, SEA）量身打造。

研究方法：本研究参考了www.wasaproject.info与www.wasa.csir.co.za公开的信息与文档资料。

数据集局限性：本数据集受风能图谱方法学与WAsP（Wind Atlas Analysis and Application Program）模型的适用边界限制，其精度取决于以下三方面：a) 经验证数值风场图谱（Verified Numerical Wind Atlas, VNWA）的精度，该图谱已通过10座WASA测量塔的实测数据完成验证；b) WAsP微尺度建模效果；c) 输入的地形数据精度。
在复杂地形（RIX＞5%）场景下，WAsP微尺度建模可能会显著高估风能资源。在城市、乡镇等建成区及其周边区域，计算结果可靠性欠佳；在林区及其周边区域，结果同样可靠性不足，需结合实际情况解读与应用。
本数据集专为规划用途设计，若用于实际风电场的设计、开发与详细评估，应格外审慎，强烈建议开展本地现场实测。若后续出现更精准可靠的数据、模型与流程，本风能资源图谱可随时更新，恕不另行通知。

可用文档资料：《欧洲风能图谱（1989）》中对风能图谱方法学进行了详细阐述；WAsP的程序应用说明可参阅www.wasp.dk。南非经验证数值风场图谱（VNWA）系南非风能图谱项目的成果，详细说明可参见WASA数据下载页面http://wasadata.csir.co.za/wasa1/WASAData。

致谢：感谢WASA项目为Frogfoot应用提供风能气候与地形数据。感谢丹麦技术大学风能研究所（DTU Wind Energy）与World in a Box Oy的WAsP开发团队为Frogfoot开发提供支持。