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Using hourly ground observation, wind profile observation and weather radar observation, the diurnal variation characteristics of the reanalysis products of the Local Analysis and Forecasting System (LAPS_LIVE) and the fifth-generation reanalysis product of the European Centre for Medium-Range Weather Forecasts (ERA5) during the Meiyu period in 2020 were validated and analyzed. The results show that the correlation between the diurnal variations of surface fields in LAPS_LIVE and ground truth is higher than that in ERA5 overall. Specifically, LAPS_LIVE is not as good as ERA5 in terms of the diurnal variations of surface temperature and humidity in southwest mountainous area. LAPS_LIVE is obviously better than ERA5 in terms of the diurnal variations of sea level pressure and surface temperature and humidity in the Dabie Mountains area. The diurnal variations of sea level pressure and surface temperature and humidity in the Jianghan Plain have small biases for both reanalysis datasets. The bias of mean surface wind field in LAPS_LIVE is smaller than that in ERA5, but the diurnal variation in LAPS_LIVE is weaker and the wind speed is also lower. The diurnal amplitude and mean speed of surface wind in ERA5 are significantly stronger than the observations. The inertial oscillation characteristics of low-level wind profile in LAPS_LIVE are consistent with the observations. The time evolution and vertical shear of low-level wind field in the morning in LAPS_LIVE is better than that in ERA5, but the low-level jet at night in LAPS_LIVE is worse. ERA5 overestimates the low-level northerly winds and the southwest jet in the morning, but its average low-level wind field is closer to the observations than LAPS_LIVE.

Objective To investigate the clinical effectiveness of superior gluteal artery propeller flap combined with postoperative vacuum sealing drainage in the treatment of hip pressure injury. Methods From September 2016 to August 2020, 32 patients with hip pressure injury were treated with superior gluteal artery propeller flap combined with postoperative vacuum sealing drainage. They were 21 males and 11 females, at an average age of 56.87 (14~79) years. There were 12 patients with type Ⅲ, and 30 with type Ⅳ. The defect ranged from 30 to 56 cm2. The patients' ability to tolerate anesthesia and surgical operation for each major organ function was preoperatively evaluated. Their hemoglobin level was adjusted to ≥110 g/L and that of albumin to ≥30 g/L. The survival and therapeutic effect of the flap were observed. Results All patients were treated with superior gluteal artery propeller flap, followed by vacuum sealing drainage to maintain the operating field. All 31 flaps survived postoperatively. One patient suffered from necrosis of the medial edge of the flap due to fecal contamination, which was healed after sigmoid colostomy and redressing. Another patient suffered from secondary infection at the suture site of the flap due to high tension, and underwent skin graft later. The average follow-up period was 18 months, and there was no recurrence of pressure injury. Conclusions The superior gluteal artery propeller flap is reliable in blood supply and easy to operate. It is a reasonable option to combine with vacuum sealing drainage to reduce the complications after operation.