風(fēng)廓線雷達(dá)在白鶴灘峽谷區(qū)風(fēng)場(chǎng)探測(cè)的應(yīng)用分析

doi:10.12306/2024jms.0015

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風(fēng)廓線雷達(dá)在白鶴灘峽谷區(qū)風(fēng)場(chǎng)探測(cè)的應(yīng)用分析
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                        10.12306/2024jms.0015
                    
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中圖分類號(hào):P412.25
基金項(xiàng)目:自然科學(xué)基金資助項(xiàng)目(U2242202);四川省科技計(jì)劃資助項(xiàng)目(2021YJ0310);成都信息工程大學(xué)教師科技創(chuàng)新能力提升計(jì)劃重大項(xiàng)目(KYTD202201)

Application analysis of wind profile in wind field detection in Baihetan Canyon area

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本文利用白鶴灘水電站峽谷區(qū)2020年11月—2021年7月的觀測(cè)數(shù)據(jù),選擇多種風(fēng)場(chǎng)變化情景時(shí)段,將邊界層風(fēng)廓線雷達(dá)與地面和高空觀測(cè)結(jié)果進(jìn)行對(duì)比分析,以檢驗(yàn)風(fēng)廓線雷達(dá)在特殊地形下的探測(cè)效果。結(jié)果表明:(1)風(fēng)廓線雷達(dá)能夠準(zhǔn)確捕捉到低空0.5~1 km的風(fēng)速演變信息,且能夠反映邊界層低空急流和2~3 km低空急流的發(fā)展,以及山谷風(fēng)的轉(zhuǎn)換時(shí)間,雷達(dá)數(shù)據(jù)獲取率在地面低風(fēng)速時(shí)段較強(qiáng)風(fēng)速時(shí)段高,但受自身探測(cè)體制的制約和山區(qū)峽谷特殊地形的影響,雷達(dá)在0.5 km以下獲取的有效數(shù)據(jù)量少,且探測(cè)的風(fēng)向風(fēng)速與地面觀測(cè)存在不一致,在低風(fēng)速時(shí)段還有風(fēng)速瞬時(shí)異常增大現(xiàn)象。(2)在峽谷區(qū)大風(fēng)伴隨降水天氣中,風(fēng)廓線雷達(dá)探測(cè)有效數(shù)據(jù)的高度增加且整層數(shù)據(jù)獲取率增加,其中0.7~3.5 km數(shù)據(jù)獲取率大于90%。且能夠探測(cè)2~3 km的強(qiáng)垂直風(fēng)切變及其高度變化。當(dāng)降水增強(qiáng)時(shí),雷達(dá)探測(cè)的大氣折射率結(jié)構(gòu)常數(shù)和垂直風(fēng)速值都會(huì)顯著增大,且大值區(qū)高度上升。(3)對(duì)比風(fēng)廓線雷達(dá)與ERA5再分析數(shù)據(jù)和探空觀測(cè)的結(jié)果,發(fā)現(xiàn)在4 km以下雷達(dá)探測(cè)結(jié)果穩(wěn)定,在4 km以上由于雷達(dá)探測(cè)體制的影響,探測(cè)結(jié)果不穩(wěn)定。具體表現(xiàn)為雷達(dá)能夠準(zhǔn)確探測(cè)低空急流高度和強(qiáng)度,并獲取1~4 km冷暖平流特性。

Abstract:

Based on the observation data from the gorge area of the Baihetan Hydropower Station from November 2020 to July 2021,various wind field change scenarios were selected to conduct a comparative analysis between the boundary layer wind profile radar and ground-level and upper-air observations. This aimed to assess the detection performance of the wind profile radar in special terrain conditions. Results are as follows:(1)the wind profile radar is capable of accurately capturing wind speed evolution information at low altitudes of 0.5-1 km. It can also reflect the development of boundary layer low-level jets and 2-3 km low-level jets,as well as the transition time of mountain and valley winds. The radar data acquisition rate is higher in the period of low surface wind speed than that in the period of strong wind speed.However,due to limitations inherent in its detection system and the unique terrain of the mountain gorge,the radar has limited effective data acquisition below 0.5 km. Additionally,there are inconsistencies in the detected wind direction and speed compared to ground observations,with occasional instances of abnormal wind speed spikes during low wind speed periods.(2)During windy weather accompanied by precipitation in the gorge area,the height of valid data detected by the wind profile radar increases,and the overall data acquisition rate improves. Specifically,the data acquisition rate at 0.7-3.5 km exceeds 90%. The radar is also capable of detecting strong vertical wind shear and its height variations at 2-3 km. As precipitation intensity increases,both the atmospheric refractive index structure constant and vertical wind speed detected by the radar increase significantly,with the height of the higher values also rising.(3)When comparing the results of the wind profile radar with those of the ERA5 reanalysis data and radiosonde observations,it is evident that the radar detection results are stable below 4 km. Above this altitude,however,the detection results become unstable due to the influence of the radar's detection system. Specifically,the radar is able to accurately detect the height and intensity of low-level jets and capture the characteristics of warm and cold advection at altitudes ranging from 1-4 km.

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張強(qiáng),尹曄,白愛(ài)娟,劉雪宇,張敏.風(fēng)廓線雷達(dá)在白鶴灘峽谷區(qū)風(fēng)場(chǎng)探測(cè)的應(yīng)用分析.氣象科學(xué),2024,44(5):974-984 ZHANG Qiang, YIN Ye, BAI Aijuan, LIU Xueyu, ZHANG Min. Application analysis of wind profile in wind field detection in Baihetan Canyon area. Journal of the Meteorological Sciences,2024,44(5):974-984

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收稿日期:2023-05-31
最后修改日期:2024-02-21
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在線發(fā)布日期: 2024-11-21
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