Database of Winds and Waves. -internet version-

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1 Database of Winds and Waves -internet version- National Maritime Research Institute

2 CONTENTS 1. Outline of the Database Use of the Database on the Homepage The Database of Winds and Waves of the North Pacific The Database of Wave Height of World Oceans Use of the Database of Winds and Waves of the North Pacific by Downloading How to Download Operation Guides Contact address Technical Notes... 19

3 1. Outline of the Database The Database of Winds and Waves -internet version- enables PC users to access the database of winds and waves, which was constructed on an EWS. Although the original PC version was designed to be used by Lotus-123 macro program and was distributed by floppy disks, the software has been converted to MS-EXCEL and JAVA. World wave height distribution tables have also been added to the original one. The distribution and service are now provided via internet. Data which can be used in the database comprises two categories, i.e., scatter diagrams on sea areas in the North Pacific and wave height distribution tables for sea areas worldwide. The scatter diagrams in the North Pacific are further classified into three categories, ship reports, hindcasting and buoy measurement. The data of ship reports, hindcasting and buoy measurement were collected in , and respectively. In the case of buoy measurement, there are differences in the measured periods of individual buoys (for details, see Reference 1). The worldwide wave height distribution tables are based on measurements by micro-altimeters loaded on the satellites GEOSAT and TOPEX/POSEIDON (for details, see Reference 2). The following services are available. (1) the Database of Winds and Waves of the North Pacific on the Homepage (2) the Database of Winds and Waves of the North Pacific by Downloading (3) the Database of Wave Height of World Oceans on the Homepage Table 1 and Table 2 show the types of data available in (1) and (2) respectively. The URL of the database homepage is shown below. References 1) Iwao WATANABE, Hiroshi TOMITA and Katsuji TANIZAWA: Winds and Waves of the North Pacific Ocean , Papers of Ship Research Institute, Supplement No.14, ) Yoshitaka OGAWA and Iwao WATANABE: A Preliminary Study on Wave Statistics Derived from GEOSAT Data, 66th General Meeting of Ship Research Institute,

4 Table 1 Types of scatter diagrams available on the homepage. Data types Type of tables Hindcasting Wind Speed - Wind Direction (HIND) Wave Height - Wave Direction (HIND) Wave Period - Wave Direction (HIND) Wave Height - Wave Period (HIND) Ship reports Wind Speed - Wind Direction (SHIP) Wave Height - Wave Period (SHIP) Buoy measurements Wave Height - Wave Period (BUOY) Wind Speed - Wind Direction (BUOY) Seasons Spring / Summer / Autumn / Winter / Annual Table 2 Types of scatter diagrams available by downloading. Data types Type of tables Hindcasting Wind Speed - Wind Direction (HIND) Wave Height - Wave Direction (HIND) Wave Period - Wave Direction (HIND) Wave Height - Wave Period (HIND) Ship reports Wind Speed - Wind Direction (SHIP) Wave Height - Wave Direction (SHIP) Wave Period - Wave Direction (SHIP) Wave Height - Wave Period (SHIP) Buoy measurements Wind Speed - Wind Direction (BUOY) Wave Height - Wave Period (BUOY) Seasons Month / Spring / Summer / Autumn / Winter / Annual Fig.1 Division of sea areas. 2

5 2. Use of the Database on the Homepage The following assumes use of Netscape 4.7 or higher, or Internet Explorer 5.0 or higher as the browser. 2.1 The Database of Winds and Waves of the North Pacific Open the homepage of the database. ( On the Access menu at the bottom of the page, click [Access to North Pacific Winds and Waves Database] (Fig. 2). Fig.2 Access menu. This opens the top page of North Pacific Winds and Waves. Click the [Open File] icon button (red circle) at the upper left (Fig. 3). Fig.3 Top page of the North Pacific Winds and Waves. 3

When the data is loading the[load] button changes to [STOP] button(fig. 5).

6 A new Select Window will open (Fig. 4). Select the [Season] and [Data type] from this menu. Click the [LOAD] button to load. When the data is loading the[load] button changes to [STOP] button(fig. 5). If you click [STOP] button, then the data loading is stopped. Data loading is complete when the [STOP] button changes to the [LOAD] button again. Fig.4 Select Window. Fig.5 Select Window (loading data). 4

7 When loading is complete, the screen will return to the top page in Fig. 3, and the names of sea areas will be displayed (Fig. 6). (Operation in case of selecting buoy measurement is described at the end of this section.) Fig.6 Top page of the North Pacific Winds and Waves (after data loading). Here, double click the sea area to open a new window and display the scatter diagram for that area (Fig. 7). 5

8 Fig.7 Scatter diagram (the numbers of data for each wave height and wave direction are displayed). Note: Mean value displayed at the top right of the scatter diagram cannot be used when the following data types are selected (irrelevant values might be displayed). Wind Speed - Wind Direction (HIND) Wave Height - Wave Direction (HIND) Wave Period - Wave Direction (HIND) Wind Speed - Wind Direction (SHIP) Wind Speed - Wind Direction (BUOY) To display the data in rose chart form, click the [Rosechart] bar at the top left of the window (Fig. 8). 6

9 Fig.8 Rose chart. Note: Rose charts cannot be used when the following data types are selected. Wave Height - Wave Period (HIND) Wave Height - Wave Period (BOUY) Next, click the [ROSE CHART] icon button (red circle in Fig.9) at the upper left of the top page to display rose charts for all sea area (Fig.9). Fig.9 Rose charts for all areas. 7

10 Note: Rose charts cannot be used when the following data types are selected. Wave Height - Wave Period (HIND) Wave Height - Wave Period (BOUY) To display the maximum values for all sea areas, click the [GRAPH] icon button (red circle in Fig.10) at the upper left of the top page. Then the maximum values of wave height or wind speed, depending on the selected data type, will be displayed (Fig. 10). Fig.10 Maximum values for all areas. Note: Maximum value display cannot be used when the following data types are selected (irrelevant values might be displayed). Wind Speed - Wind Direction (HIND) Wave Period - Wave Direction (HIND) Wind Speed - Wind Direction (SHIP) Wave Period - Wave Direction (SHIP) Wind Speed - Wind Direction (BUOY) To display the sea area names, click the [SEA AREA] icon button (red circle in Fig.11) at the upper left of the screen in Fig. 6 (Fig. 11). 8

11 Fig.11 Names of sea areas. < Selection of buoy measurement data as the [Data type] > When buoy measurement data is selected, the buoy number (Fig. 12) will be displayed instead of sea area names, and the displayed data will correspond to each buoy (Fig. 13). The methods of other operations are the same as in the case of ship reports and hindcasting. Fig.12 Buoy numbers. 9

12 Fig.13 Maximum values at buoys. 10

2.2 The Database of Wave Height of World Oceans On the Access menu at the bottom of the database homepage, click [Access to Wave Height Database of World Oceans] (Fig. 14). Fig.14 Access menu.

13 2.2 The Database of Wave Height of World Oceans On the Access menu at the bottom of the database homepage, click [Access to Wave Height Database of World Oceans] (Fig. 14). Fig.14 Access menu. This opens the top page of the Wave Height Database of World Oceans (Fig. 15). Double click the desired sea area to open a new window and the significant wave height distribution of that sea area for all seasons is displayed (Fig. 16). Fig.15 Top page of Wave Height Database of World Oceans. 11

14 Fig.16 Distributions of significant wave height. 12

15 3. Use of the Database of Winds and Waves of the North Pacific by Downloading 3.1 How to Download On the Access menu at the bottom of the database homepage, click [Download for Winds and Waves Data in the North Pacific] (Fig. 17). Fig.17 Access menu. This opens a Registration Form (Fig. 18). Following the instructions, fill out and send the Form. 13

16 Fig.18 Registration form. After you have sent the Registration Form, the screen will change to indicate the download file (Fig. 19). The file size is approximately 2.5MB, which is compressed in the Zip format. Fig.19 Instruction of downloading. 14

When you click the file name wave_xls.zip, the browser will confirm whether you want to download. Select save in the file, and save the file in an appropriate folder.

17 When you click the file name wave_xls.zip, the browser will confirm whether you want to download. Select save in the file, and save the file in an appropriate folder. When downloading is complete, un-zip the file. At this time a folder named wave_xls will be created automatically, and the files will be created in this folder. 3.2 Operation Guides The following explains the method of operating the North Pacific Winds and Waves Database of EXCEL version, assuming that MS-EXCEL has been installed and the database has been downloaded correctly. Open the EXCEL file named wavedb.xls which exists in the folder wave_xls. If asked whether macro files should be valid or not, make them valid. The worksheet of menu will open automatically (Fig. 20). Fig.20 Worksheet of menu. Select the data type, area name and season in the selection boxes on the menu (Fig. 21). (If buoy measurement data is selected, the buoy No. will be displayed in place of the area name.) 15

Fig.21 Selection boxes on the worksheet of menu. After completing these selections, click the [DISPLAY] button. The scatter diagrams will be output in [table 1] and [table 2] (red circle in Fig. 20).

18 Fig.21 Selection boxes on the worksheet of menu. After completing these selections, click the [DISPLAY] button. The scatter diagrams will be output in [table 1] and [table 2] (red circle in Fig. 20). The worksheet [table 1] shows the numbers of frequencies (Fig. 22), while [table 2] shows percentages (Fig. 23). To return to the menu, click the [MENU] button or select [menu] on the worksheet. It is now possible to perform file output, copy, combine, and other operations using the functions of MS-EXCEL. 16

19 MENU DISPLAY WAVE HEIGHT - WAVE PERIOD AREA SHIP DATA Annual MEAN OF WAVE HEIGHT 1.60 (W) e01 MEAN OF WAVE PERIOD 5.01 (SBC) TOTAL TOTAL MAX MAX Fig.22 Scatter diagram (number of frequencies). MENU DISPLAY AREA e01 WAVE HEIGHT - WAVE PERIOD SHIP DATA Annual TOTAL % 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % 0.000% 0.000% 0.000% 0.083% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.083% % 0.083% 0.083% 0.167% 0.167% 0.250% 0.250% 0.000% 0.000% 0.083% 0.083% 1.167% % 0.083% 0.000% 0.000% 0.250% 0.083% 0.083% 0.000% 0.250% 0.000% 0.000% 0.750% % 0.083% 0.417% 0.000% 0.250% 0.500% 0.167% 0.000% 0.083% 0.167% 0.000% 1.750% % 0.167% 0.750% 1.000% 0.917% 0.917% 0.500% 0.167% 0.000% 0.000% 0.250% 4.667% % 1.833% 2.583% 1.583% 1.833% 0.667% 0.250% 0.250% 0.167% 0.000% 0.083% % % 4.250% 2.583% 2.333% 2.083% 0.583% 0.583% 0.083% 0.083% 0.000% 0.083% % % % 6.750% 4.167% 2.250% 0.250% 0.333% 0.000% 0.083% 0.000% 0.000% % % 4.417% 3.333% 1.167% 1.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% % TOTAL % % % % 8.833% 3.250% 2.167% 0.500% 0.667% 0.250% 0.500% % Fig.23 Scatter diagram; (percentage). 17

20 4. Contact address For further information please contact: National Maritime Research Institute Shinkawa, Mitaka, Tokyo, , Japan Fax:

21 5. Technical Notes < Units and Seasons > The units and seasons used in the database are shown in Table 3 and Table 4 respectively. Table 3 Units. Item Wind direction Wind speed Wave direction Wave height Wave period Unit degree knot degree meter second Season Spring Summer Autumn Winter Annual Table 4 Seasons. Months from March to May from June to August from September to November from December to February from March to February Table 5 Location and measuring duration of buoys. Mark Number Location Observation Period N, W N, W N, W N, W N, W N, W N, W N, W N, W N, W N, W N, W N, W N, E N, E N, E N, E N, E

22 < Scatter Diagrams > In the scatter diagrams TOTAL shows the sum of each row and column. MAX1 shows the maximum value of item A in the scatter diagram of A-B (wind speed in Fig.24). MAX2 is the value of item B when MAX1 occurred. (1) Wind Speed - Wind Direction MENU DISPLAY AREA e01 WIND SPEED - WIND DIRECTION HIND DATA Annual MEAN OF WIND SPEED (KT) Wind speed TOTAL TOTAL MAX MAX Wind direction Fig.24 An example of scatter diagram; Wind Speed - Wind Direction. (2) Wave Height - Wave Direction MENU DISPLAY AREA e01 WAVE HEIGHT - WAVE DIRECTION HIND DATA Annual MEAN OF WAVE HEIGHT 2.08 (M) Wave height TOTAL TOTAL MAX MAX Wave direction Fig.25 An example of scatter diagram; Wave Height - Wave Direction. 20

23 (3) Wave Period - Wave Direction MENU DISPLAY AREA e01 WAVE PERIOD - WAVE DIRECTION HIND DATA Annual MEAN OF WAVE PERIOD 7.27 (SBC) Wave period TOTAL TOTAL Wave direction Fig.26 An example of scatter diagram; Wave Period - Wave Direction. (4) Wave Height - Wave Period MENU Wave height DISPLAY WAVE HEIGHT - WAVE PERIOD AREA HIND DATA Annual MEAN OF WAVE HEIGHT 2.08 (W) e01 MEAN OF WAVE PERIOD 7.26 (SBC) TOTAL TOTAL MAX MAX Wave period Fig.27 An example of scatter diagram; Wave Height - Wave Period. 21

24 < Folder / File Names When Downloaded > The first folder of the North Pacific Winds and Waves Database is wave_xls. The folders under that folder are identified by assigning names consisting of 8 characters. The first 2 characters express the types of data: bt: buoy measurement ht: hindcasting st: ship reports Characters 5-7 are the item code, and express the item using a combination of numbers: 0: none 1: wind direction 2: wind speed 3: wave direction 4: wave height 5: wave period The files in all folders are text files. The file names are identified as follows: Area Name.k3 < Contents of Files > The contents of the files are shown below by comparison with scatter diagrams. Data classification code shows the data type (Table 6). Year code shows the years (last two digits of western calendar year) when the data accumulation is completed. The season codes identify data as monthly, seasonal or annual (Table 7). The weather code represents winds as 1 and waves as 3. The area name is indicated in Table 8. The total of all values and the values of MAX1 and MAX2 are calculated in advance. "Average value" is obtained by dividing "Total of all values" by "Total number of data". The value of TOTAL is obtained by calculation in the MS-EXCEL macro. Table 6 Data classification codes. Data type Code Ship reports 1 Buoy measurement 2 Hindcasting 3 22

25 Table 7 Season codes. Season Code from Jan. to Dec. from 1 to 12 Spring 15 Summer 16 Autumn 17 Winter 18 Annual 19 Table 8 Area names. Area Area name All areas ALL All of E areas E% All of M areas M% All of W areas W% Others (an area) 3 23

26 MENU DISPLAY WAVE HEIGHT - WAVE PERIOD AREA SHIP DATA January MEAN OF WAVE HEIGHT 2.79 (W) all MEAN OF WAVE PERIOD 7.16 (SBC) TOTAL TOTAL MAX MAX average value Fig.28 An example of scatter diagram; Wave Height - Wave Period, all areas in January. data classification code weather code year code item code "1","88","450","3","ALL","1", , ,0,0,3,3,3,31,7,6,5,14 total of all values 0,0,0,0,3,3,8,2,1,1,8 season code 0,0,0,1,12,2,11,3,7,5,11 2,4,2,5,23,15,86,19,40,23,44 area name 4,2,1,2,23,18,22,11,39,14,42 4,4,42,45,130,89,177,65,140,39,126 9,9,68,74,179,107,197,79,161,59,179 11,13,113,120,307,215,398,164,302,76,259 11,42,1060,554,977,706,1015,336,672,225,476 number of data 98,347,655,845,1756,1205,1921,696,1265,353, ,817,1468,1958,4475,3062,4455,1350,2098,469, ,2431,4744,7126,12673,7499,7518,1994,2513,780, ,9024,14367,17773,21336,8826,7971,2095,2513,624, ,22921,23143,19248,18045,6416,6273,1425,1978,638, ,19869,10746,6734,6280,2148,2360,501,982,294, ,2094,523,228,331,117,174,91,14,4,8 MAX ,12.00,12.50,15.00,15.00,19.00,20.00,20.00,18.00,17.00, ,5.00,6.00,7.00,8.00,9.00,10.00,11.00,12.00,13.00,14.0 MAX2 Fig.29 An example of text file; wave_xls/st994503/all.k3. 24

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