Sea surface height oscillation with quasi-four-month period along the continental slope in the northern South China Sea

The sea surface height oscillation with a quasi-four-month period （SSHO4） along continental slope in the northern South China Sea （NSCS） is detected using satellite altimeter data and an ocean model simulation. The SSHO4 is at southwest of Dongsha Island, and is characterized by a wavelength of-600 km and a southwestward phase speed of-0.1 m/s. Crossing the climatological background SST front, geostrophic currents corresponding to the SSHO4 generally induce sea surface temperature （SST） ＂tongues＂ during January-March. The cold and warm SST tongues appear southwest of cyclonic and anticyclonic eddies, respectively. The distance between the warm and cold SST tongues is about half the wavelength of the SSHO4. The geostrophic currents play an important role in lateral mixing, as manifested by the SST tongue phenomena in the NSCS.

浅论衬砌拱的合理设计方法

本文针对现行高速公路边坡防护大多采用衬砌拱进行集中排水的型式，对衬砌拱的流水槽宽度、间距等进行了分析计算，推导了简易的计算公式，特别指出衬砌拱的流水槽宽度与其间距应具有一定的比例关系，且都与降雨强度及路面宽度以及路面径流系数成正比，衬砌拱的设计应结合高速公路各路段的降雨强度以及路面宽度等实际状况，不应任意设计，并给出了部分计算结果表，可供实际工程设计参考。