It is very important to study the nontidal region, because characteristics in this area are very useful to us, for example, the tide range is small and the tide current is very strong. Suspended load isn’t easy to de...It is very important to study the nontidal region, because characteristics in this area are very useful to us, for example, the tide range is small and the tide current is very strong. Suspended load isn’t easy to deposite and the bed load is easy to move along the sea bed. Since 1936 many scientists think that there is a nontidal point M2 in the old eatuary (38°-38°10′N, 119°-119°20′E), and have determined the location of nontidal point. According to our observation, it isn’t a nontidal point but a nontidal line. This line is located near the section B.On the 15th day of lunar calendar this line is just located at section B, and in other days this line moves toward section A, but does’nt arrive in seetion A. The tide data that,have been observed on coast tide stations give eloquent proof of fact of nontidal line. In this region of near nontidal line the current speed is more than 90cm/sec., and the maximum is 120cm/sec. The minimum of tide range is about 30cm and the maximum is about 100cm. During the flood tide the current direction is south-east, and north-weat during the ebb tide. The residual current speed on section B is about 0.2 knot,and flow into north-west.展开更多
The Huanghe River is the second largest river in our country. The average annual runoff at the estuary is 44.28 billion cubic meters, the average annual suspended load is 1.12 billion tons, of which 24% was deposited ...The Huanghe River is the second largest river in our country. The average annual runoff at the estuary is 44.28 billion cubic meters, the average annual suspended load is 1.12 billion tons, of which 24% was deposited on the delta, 40% on the coast and the rest 36% is considered to be carried into the deep sea by various dynamic factors. We've measured the temperature, salinity, current and suspended load in the estuary from autumn of 1983 to summer of 1984 for building a harbour in future. According to our data and other historical data from some institutes, we've obtained following conclusions: 1) The distribution of temperature in winter is different with from that in summer: the contours of temperature in winter is parallel to coast line,and the contours of temperature in summer is coincident with latitudes. 2) The salinity in summer is lower than that in winter. There are three tongues of low values of salinity at the estuary in summer. They are pointed to North,North-east and South-east respectively. Only two tongues are appeared in winter-northward and south-eastward. 3) The distribution of suspended load is similar to the distribution of salinity,There are three tongues of high values of suspended load at the estuary in summer, they are pointed to North,North-east and Southeast respectively,the quantity of suspended load per litre in winter is much than in summer. 4) The influence of Huanghe River to North area of the estuary is less than to Laichou Bay. 5) The velocities of tide current at the estuary are very large.The maximum value is about 150era/see, and the directions of tide current are parallel to coastline.展开更多
文摘It is very important to study the nontidal region, because characteristics in this area are very useful to us, for example, the tide range is small and the tide current is very strong. Suspended load isn’t easy to deposite and the bed load is easy to move along the sea bed. Since 1936 many scientists think that there is a nontidal point M2 in the old eatuary (38°-38°10′N, 119°-119°20′E), and have determined the location of nontidal point. According to our observation, it isn’t a nontidal point but a nontidal line. This line is located near the section B.On the 15th day of lunar calendar this line is just located at section B, and in other days this line moves toward section A, but does’nt arrive in seetion A. The tide data that,have been observed on coast tide stations give eloquent proof of fact of nontidal line. In this region of near nontidal line the current speed is more than 90cm/sec., and the maximum is 120cm/sec. The minimum of tide range is about 30cm and the maximum is about 100cm. During the flood tide the current direction is south-east, and north-weat during the ebb tide. The residual current speed on section B is about 0.2 knot,and flow into north-west.
文摘The Huanghe River is the second largest river in our country. The average annual runoff at the estuary is 44.28 billion cubic meters, the average annual suspended load is 1.12 billion tons, of which 24% was deposited on the delta, 40% on the coast and the rest 36% is considered to be carried into the deep sea by various dynamic factors. We've measured the temperature, salinity, current and suspended load in the estuary from autumn of 1983 to summer of 1984 for building a harbour in future. According to our data and other historical data from some institutes, we've obtained following conclusions: 1) The distribution of temperature in winter is different with from that in summer: the contours of temperature in winter is parallel to coast line,and the contours of temperature in summer is coincident with latitudes. 2) The salinity in summer is lower than that in winter. There are three tongues of low values of salinity at the estuary in summer. They are pointed to North,North-east and South-east respectively. Only two tongues are appeared in winter-northward and south-eastward. 3) The distribution of suspended load is similar to the distribution of salinity,There are three tongues of high values of suspended load at the estuary in summer, they are pointed to North,North-east and Southeast respectively,the quantity of suspended load per litre in winter is much than in summer. 4) The influence of Huanghe River to North area of the estuary is less than to Laichou Bay. 5) The velocities of tide current at the estuary are very large.The maximum value is about 150era/see, and the directions of tide current are parallel to coastline.
