河西走廊风能时空特征

Spatiotemporal characteristics of wind energy resource in Hexi corridor

利用河西走廊地区1970—2004年风速气候资料和2004年9月-2005年8月周年风塔精细资料，采用气候订正和即时风速订正，得到接近自然的风速，依此研究了该区域近地面70m层内风能分布。结果表明：河西走廊区域风速变幅较小、气候变化趋势较稳定；有效风速（≥3m／s）时数在6000h／a，10m高度风能大多在150w／m^2以上，风能随高度线形增长（在70m高度层内），平均每升高10m风能增加28w／m^2；10～70m层内总风能年储量相当丰富，普遍在1．5×10^16 kWh／m^2（千瓦时／平方米）以上，潜在年产值达千万亿元。河西走廊风能存在明显周日和月季变化，风能和有效风速时数存在空间差异，其时空差异与河西走廊独特的戈壁下垫面关系密切。

To study the spatiotemporal variations of wind and its power in Hexi Corridor, the natural wind speed was gotten from wind speed data of 19 stations from 1970 to 2004 and wind intensive data with 10-minute-interval of 7 wind-towers from Sep. 2004 to Aug. 2005 in Hexi Corridor through climatic and instant wind speed correction The results showed that the wind speed range had little change. The climate change inclined to stable state. Effective wind speed（ ≥3 m/s） time and energy were more than 6 000h/a and 150 W/m^2 at 10m height in most parts respectively. The wind energy increased linearly along with height in the rate of 28 W/m^2 per 10 meters from 10m to 70 m. The total wind energy was rich at the height from 10m to 70 m over 1.5 × 10^16 kWh/m^2 annually and the potential annual output value reached 1 × 10^15 Yuan RMB. The wind energy had obvious daily and monthly variation in Hexi Corridor. In a day, the occurring time of maximum or minimum wind energy value in high layer lagged to that in the low layer; the smallest wind energy occurred from 6：00 to 8：00 and the strongest happened from 16 ： 00 to 19：00. In a year, the maximum value occurred from Mar. to Apr. and the minimum one happened in autumn. The wind energy decreased gradually from north to south with two high value centers of Anxi and Gulang in Hexi Corridor. The spatiotemporal variations of wind related to the unique underlying surface of Gobi in Hexi Corridor.