Natural conditions of Shidao Port

According to the statistics of the measured data of Shidao Town Meteorological Station 1954- 1978 in Rongcheng City:

The annual average temperature is 1 1.8 cc, the hottest month is August, and the monthly average temperature is 24.5 ~ C, which is the extreme highest temperature over the years.

36.8 ~ c (1958 July 2 1). The maximum temperature in Leng Yue is 65438+ 10 month, the monthly average temperature is 1.2 ~ C, and the extreme minimum temperature over the years is14.6 ~ c.

(1959 65438+1October 8th,1970 65438+1October 4th).

Precipitation The annual average precipitation is 858.3mm, mostly concentrated in July-September, accounting for 60% of the annual precipitation. Most years

The precipitation is1218.2 mm (1964). The daily precipitation is ≥ 25mm, and the annual average precipitation days is 9.6 days, with the maximum of 14 days.

(1963, 1966), at least 1 day (1958).

The wind is often northerly, with the frequency of 17%. The secondary wind direction is north-northwest with a frequency of 15%, and the strong wind is north-northeast

Monsoon has obvious characteristics, with northerly winds prevailing in winter and southerly winds prevailing in summer. Spring and autumn is a transitional season, and the wind direction is changeable. Annual average value

The wind speed is 4. 1 m/s, the maximum wind speed is 34 m/s, and the average annual gale days of I>8 are 49. 1 day, and the maximum is 102 days.

(1965), at least 16 days (1954).

The average number of foggy days in a foggy year is 52.7 days, mostly from April to July, accounting for 75% of the foggy days in the whole year. Maximum number of foggy days per year

79 days (1964), and the minimum number of foggy days in the whole year is 29 days (1958).

Shidao Port is an ice-free port. The tide in Shidao Port belongs to irregular semidiurnal tide. According to the tidal data statistics of Shidao Port 1955- 1957:

The highest high tide level is 3.39 meters, and the lowest low tide level is 0.57 meters.

The average high tide level is 2.52m, and the average low tide level is 0.8l

The average sea level is1.66m.

The above tidal level datum is the theoretical depth datum (below the average sea level of the Yellow Sea in l9561.565m).

Tide According to the third volume of China Bay Records, during the high tide in Shidao Bay, seawater enters from the east side of the bay mouth from the northwest.

Enter the bay and leave the bay from the west side of the bay mouth to the south. At low tide, the direction of seawater movement is opposite to that at high tide.

The measured maximum tidal current is 0.72m/place at the mouth of the bay and 0.3m/s in the bay. The maximum ebb tide is 0.79m/

Seconds, bay 0. 37 meters per second.

According to the third volume of China Bay Records, the wave types outside Shidao Bay are mainly wind and waves, and the annual frequency of wind and waves is

98%, surge accounted for 26%, with an average wave height of 0.3 meters; The average period is 2.2 seconds. The normal wind wave direction is southwest, and the normal swell direction is

To the south, there are many northeast winds in winter, so the northerly waves are the main ones. Southeast winds prevail in summer, so the south wind waves increase and turn in spring and autumn.

In different seasons, the southwest wind and waves are the most in spring and the north wind and waves are the most in autumn. Shidao Bay is open to the southeast in summer.

Strong waves in the southeast of the season can be directly introduced into the bay. Geological Shidao Port is located in the southeast of Jiaodong uplift in geological structure. According to the exploration in Shidao Port 1960 and 1964.

According to the data, the stratum in the water area of the wharf area includes Quaternary medium-coarse sand layer, silty sand layer and clay layer. From top to bottom along the coast

The bottom is coarse sand layer, silt layer, clay layer, coarse sand layer and weathered rock layer. Strata in waters near the vertical coast

It should be silt, clay and weathered rock. The bedrock near the existing wharf is shallow and partially exposed.

The basic intensity of Shidao Port earthquake is 7 degrees. Shidao Bay has a wide water area, stable coastline, poor sediment sources and small siltation, but the bedrock is shallow and the water depth is small.

The average depth of the bay is about 5m, and the10m isobath has reached the mouth of the bay.

The harbor has good shielding conditions for northeast waves, but the southeast (strong wave direction) waves in the open sea can still affect the port area. Chutu i.

The southern end is superior in water depth, but the waves are big and there is no cover.