Tidal time of tidal table

Theoretically, the time of tide should be consistent with the time of the moon's upper or lower transit, but in practice it is often delayed. The time between the high tide and the transit on the moon is called the high tide gap. However, the gap between climaxes varies from place to place. For example, Weihai is 10:50, Yantai is 10:25, and Longkou is 10:20, which shows that different geographical locations lead to different high tide intervals. Approximate calculation method of high tide and low tide: high tide = (daily range) 0.8× (lunar day) 7- 16 (first half-1, 16)+ high tide interval, low tide = high tide -6: 12. For example, the tidal time of the fifth lunar month in Weihai is as follows. After years of offshore practice and verification, we have explored a set of simple and standardized calculation methods. Its method is lunar calendar day (-3 in the first half and-18 in the second half) x 0.8, which is the climax time of the day. For example, the tidal time of the fifth lunar month in Weihai is as follows: the time of high tide =(5-3)×0.8 = 1:36' (i.e. the first high tide). Low tide =1:36'+6:12' = 7: 48' (then the first low tide). For example, calculate the tidal time on the fifth day of the fifth lunar month in Weihai: the high tide time = (25-18) × 0.8 = 5: 36' (i.e. the first high tide). At low tide = 5: 36'+6:12' =11:48' (at the first low tide), tidal current, also known as tidal current, is a tidal signal phenomenon of water level fluctuation and the result of horizontal flow of seawater under the action of tidal force. Therefore, the tidal current has the same periodic variation law as the tide, but the seawater flow is affected by the topographic conditions, so it often presents two States, one is reciprocating motion, and the other is rotating motion. Here we don't talk about the causes of rotating flow, but only introduce the reciprocating flow in the offshore area. Reciprocating flow (that is, east flow and west flow), that is, high tide and low tide, is a tidal current that changes periodically in two opposite directions and is called reciprocating flow. After years of practice, it has been proved that its change in the coastal area of Shandong Peninsula is advection (no current) about two hours before the start of the current, generally starting from the west about two hours before the high tide, with the maximum velocity at the high tide and ending in the west about two hours after the high tide, and ending in the east about two hours before the low tide, with the maximum velocity at the low tide. From the end of flow to the beginning of flow, there is about two hours of advection (no flow) or shunt time. The above contents may not be applicable to the high seas, especially seafarers, who may not make navigation plans according to this method. This method is only suitable for coastal areas, especially Shandong Peninsula, which is more accurate and has great practical value for offshore fishing enthusiasts.

List number of tide tables of major ports Provincial and municipal port names 9036 N 9036 E Macau Macau Port 2213' North16 5438+0333' East 7038 Dongshan Port 23 44' North16 5438+0732' East. Fuan Saiqi 26 58' north 1 1 9 40' east 70 13a Fuqing Bay (Matsushita Port) 25 41'north16 5438+09 35' east 702/kloc. 9 697024 Chongwu, Hui 'an County, Fujian Province 24 53' north118 57' east 7026 Shenhu Port, Jinjiang City, Fujian Province 24 37' north1/kloc-0 40' east 7026a Weitou, Jinjiang City, Fujian Province 24 3 1 08 34' East 7006a Fujian Province Lianjiang County Huangqi 26 20' North 6554 Fujian Province (Shantou) 26 08' North1Kloc-0/9 34' East 7033 Fujian Longhai Shima 24 27' North1Kloc-0/7 49' East. Kloc-0/941'East 7028 Shijing 2438' North 655 25' North11907' East 7023 Fujian Putian Tiwu 25 08' North1. East 7025a Quanzhou, Fujian 24 54' North1KLOC-0/840' East 7025a Quanzhou (Shihu) 24 49' North1842' East 7035a Xiamen Port, Xiamen City, Fujian Province 24 27' 804' East 7003 26 55' North 120 Jun 'ao 24 02' North1754' East 9 107 Bohe 2129' North/KLOC, Dianbai County, Guangdong Province. 2130' north115' east 9 108a Xige 2128' north165438, Dianbai County, Guangdong Province. 4' East 9048a Haiqinsha 22 58' North 65433 Sha (Shuiniutou) 22 45' North 113 34' East 9045 Sampan Island 22 43' North13 40' East 9045. Kloc-0/4 32' East 90 19b Mabianwei (Guangzhou Petrochemical) 22 4020 33' North10950' East 90 13 Jiazigang 22 49' North16 000, Lufeng City, Guangdong Province 2128' north1104' east 900 1 Guangdong Nanao Island (Yun 'ao Bay) 23 24' north1706' east 90066. 23 36' North116 58' East 90 16 haimen port (Guangdong) 2311'North16 37' East 9007 Shantou Port, Guangdong. 23 2 1' North11644' East 9 180 Dongsha Island (dongsha islands) 20 42' North1643' East 90/kloc-0. 5 22' East 906543822 38' North1348' East 909 1 Shangchuan Island (Sanzhouwan) 2145' North12, Taishan City, Guangdong Province. Kloc-0/013' Northeast10 32' East 9 103 Beijin Port 2148' North1201' Kloc-0/6543838+01331'East 9040a Guangdong Zhuhai Dawanshan Island 2156' North1343' East 9086 Guangdong Zhuhai Denglongshan 22/Kloc-. Guishan Island 2201'North11342' East 9039 Guishan Island 2208' North11349' East 9069 Hengshan Island 2220' North 65439. Jing 'an 438+0' East 9078 (Bai Jiao) 22 1 3' North13' East 9043 Guangdong Zhuhai Neilingding Island 22 25' North1348. 65438 Zhuhai Harbor, Zhuhai City, Guangdong Province 9083a2217' North1335' East 2156' North1314' East. 00905' Tieshan Port (Shitoubu) East136' North10935' East 10003 Weizhou Island 21Kloc-0, Beihai City, Guangxi Province. 10814' east 10009 Fangchenggang, Guangxi 2136' north108 20' east 10008 Baojiao, Fangchenggang, Guangxi 21. 5438+00 Qisha Port, Fangchenggang, Guangxi 2135' North108 29' East100/2 Pearl Harbor, Fangchenggang, Guangxi 2131'North108. Longmen Island (Qinzhou Port) 2145' North10833' East 9 170a Macun Port, Chengmai County, Hainan Province1957' North1002' East 9/kloc. Kloc-0/57 931'East 91441825' North10958' East 9 134 qionghai city, Boao, Hainan19. 38+0 Gemini Reef in Sansha City, Hainan Province (Nansha Islands)1127' North1419' East 9 18 1b Yongshu Reef in Sansha City, Hainan Province (Nansha Islands Kloc-0/8666 Huanghua Port (Phase I Coal Terminal) 38 1 9' North17 53' East 2005 Qilihai, Qinhuangdao City, Hebei Province (newly opened) 39 35' North1Kloc-0/9. 9 37' East 20065438+ Hebei Tangshan Jingtang Port (Tangshan) East 2006a Caofeidian 38 54' North118 30'. 3913' north11kloc-0/'east 4002 Lianyungang, Jiangsu 3445' north11925' east 4003 Lianyungang, Jiangsu 3429' north 65433. 23 32 08' North12137' East 4029 Jiangsu Nantong Tiansheng Port 32 02' North120 45' East 402 1a Jiangsu Nantong Yangkou Port 32 30' North 128. 4005a Binhai Port 3416' North12016' East 40 15a Dafeng Port 331120 43, Yancheng City, Jiangsu Province Dalian, Liaoning12052' East 4009 Sheyang Estuary 33 49' North12030' East 40 12 Xinyang Port 33 37' North12028' East 1025. 38 52' North12141'East 1022 Dayaowan (Southern Circle) 39 01'North12154' East 65. 3916' North12136' East 1028a 39 03' North121028' East, Jinxian County, Dalian City, Liaoning Province 8 Xiaochangshan Island, Dalian, Liaoning Province 39 65433 Dandong New Port, donggang city, Liaoning 39 45' North123 45' East 1005 Shishanzi, donggang city, Liaoning 39 50' North124 09' East 1008 donggang city Stone, Liaoning. Tuanshanjiao (Erhekou), Huludao City, Liaoning Province 40 29' north120 50' east 1044 Huludao City, Liaoning Province 4014' north120 28' east1054. 9 55' east 6543340 48' north12104' east 1040 40 58' north150' east/wafangdian city, Liaoning Province. 438+0037 Bayuquan 4018' North12205' East 1038 Yingkou Port (Sidaogou) 40 38' North12209' East 9/Liaoning Yingkou City 3' North 58 57' East 2065438+ Fenggang (Taoerhekou) 3815' North1810' East 3007a Dongying Port 38 06' North1Shandong Province. +08 27' Shandong Haiyang Qianliyan 3054 East 3616' Shandong jimo city Niudao Port 3059 North12123' Shandong Laizhou 3622 North12052' East 30 12a. Longkou Port 38+0 19 East 30 19  Island 38 24 North120 55120 42' Penglai Port East 3025 37 49' Qiongji Island North120 49'. Kloc-0/0' Huangdao Island North, Qingdao City, Shandong Province120 45' Huangdao East, Qingdao City, Shandong Province 3063 09' Qingdao Port East 3062 Qingdao Port 3605' North 120 650 Shandong Province 37 23' North122 4/Kloc. Kloc-0/22 26 48' North 1 2129' East 3030a Weihai Port, Weihai City, Shandong Province 37 31'North122 08' East 3065438++0/. 2210' East 3028 Yantai Port, Yantai City, Shandong Province 37 33' North12123' East 50000. 3132' North12138' East 5007 Shanghai Gao Qiao 3121'North134' East 5009 Shanghai Huangpu Park 3650. 5 Shanghai Jinshanzui 50 1 1 Shanghai Zhongjun 3107' North154' East 80 1 1 Kaohsiung Port, Kaohsiung City, Taiwan Province Province, 22 36' North120 60. Keelung Port 25 09' North12144' East 80 17 Magong Port (Penghu Island) 23 33' North19 24' East 20/. Kloc-0/2 Tanggu, Tianjin (Tianjin+002' East 606 1 Haimen (Zhejiang) 2841'North127' East 606 1a haimen port, Haimen, Zhejiang (Baisha). 28 42' North12138' East 6014 30 24' North120 54' East 601Kloc-0/Zhajia, Jiaxing City, Zhejiang Province 28 05' North of Kanmen Port, Yueqing City, Zhejiang Province12165438' East 6037A 29 56' Meishan North, Ningbo City, Zhejiang Province10/'East 6047 29 49. 438+0' Zhejiang Ningbo Port East 6035 29 53' North 12 1 33' Zhejiang Ningbo Qitoujiao East 6042 29 54' North122 07' Zhejiang Ningbo Zhenhai East 6036 (Xiaoqutou) 29 59' North/kloc-. 44' Nanji Shandong, Pingyang County, Zhejiang Province 6076902' Qimen Port North, Sanmen County, Zhejiang Province12138' Qimen Port East, Sanmen County, Zhejiang Province 6059a, Xiadachen Island East, Taizhou City, Zhejiang Province 1265438. Mencun 28 20' North 12 1 3' Wenzhou Port East 6072 28 02' North120 39' Shipu Port East 6056 2912' North 65438+ in Xiangshan County, Zhejiang Province. 506039a Dinghai Port, Zhoushan City, Zhejiang Province 30 00' North 1 2204' East 6028 Ligang Port, Zhoushan City, Zhejiang Province 30 04' North121KLOC-0/'East 6002 Luhuashan, Zhoushan City, Zhejiang Province (West Lu Hua Island) 22 36' East 6032 Shenjiamen Port 37' North12137' East 6025 Zhejiang Zhoushan West Wharf 3007' North122 08' East 6020 Zhejiang Zhoushan Changtu Port 3015' North/Kloc.