{"id":283,"date":"2026-05-18T23:41:07","date_gmt":"2026-05-18T15:41:07","guid":{"rendered":"https:\/\/pft-s.com.tw\/?page_id=283"},"modified":"2026-05-18T23:41:07","modified_gmt":"2026-05-18T15:41:07","slug":"sample-case-1-changhua-climatology","status":"publish","type":"page","link":"https:\/\/pft-s.com.tw\/en\/metocean-data-service\/sample-case-1-changhua-climatology\/","title":{"rendered":"Sample Case 1 \u2014 Changhua Sea Climatology Study"},"content":{"rendered":"<p style=\"text-align:center;font-size:18px;font-weight:600;color:#2c3e50;margin:0 0 14px;\">A representative-point Level 1 metocean desktop study, end-to-end<\/p>\n<p style=\"text-align:center;margin:0 0 14px;\"><span style=\"display:inline-block;padding:4px 14px;background:#ecf5ec;color:#2c8568;border-radius:12px;font-size:13px;font-weight:600;\">\u23f1 ~5 min read<\/span><\/p>\n<p style=\"text-align:center;color:#888;font-size:14px;margin:12px 0 0;\">This page summarises a methodology sample produced by PF Tech Services Ltd. Full PDF download at the bottom of this page.<\/p>\n\n\n\n\n<h3 style=\"text-align:center;font-style:italic;font-size:22px;font-weight:600;color:#2c3e50;line-height:1.6;margin:0;\">Within the 2019\u20132023 analysis window at the representative offshore Changhua selection point, the strongest sea states were driven by sustained northeast-monsoon events \u2014 not by direct typhoon passage.<\/h3>\n\n\n\n\n<h3 style=\"text-align:center;color:#34495e;font-size:18px;margin:0 0 20px;\">Site location<\/h3>\n<div style=\"margin:14px 0;max-width:900px;margin-left:auto;margin-right:auto;\"><iframe src=\"https:\/\/www.google.com\/maps?q=24.05,119.80&#038;z=8&#038;output=embed\" width=\"100%\" height=\"420\" style=\"border:1px solid #e0e0e0;border-radius:4px;\" loading=\"lazy\" referrerpolicy=\"no-referrer-when-downgrade\"><\/iframe><\/div>\n<p style=\"text-align:center;font-size:13px;color:#888;margin:10px 0 0;\">Selection point 24.05\u00b0N, 119.80\u00b0E (centre marker on map) \u2014 approximately 50 km off the Changhua coast.<\/p>\n\n\n\n\n<h2 style=\"color:#2c8568;font-size:28px;font-weight:700;margin:0 0 32px;\">\u25b6 Executive Summary<\/h2>\n<p style=\"font-size:17px;font-weight:600;color:#5a7d6d;letter-spacing:1px;margin:36px 0 14px;padding-left:14px;border-left:4px solid #50B498;\">At a glance<\/p>\n<table style=\"width:100%;border-collapse:collapse;background:#fff;margin:14px 0;border-radius:4px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,0.05);\">\n<tbody><tr><td style=\"padding:14px 18px;font-weight:600;color:#2c3e50;width:30%;border-bottom:1px solid #ecf0f1;\">Selection point<\/td><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">24.05\u00b0N, 119.80\u00b0E \u2014 representative offshore Changhua selection point<\/td><\/tr>\n<tr><td style=\"padding:14px 18px;font-weight:600;color:#2c3e50;border-bottom:1px solid #ecf0f1;\">Window<\/td><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">2019\u20132023 hourly (5 yr) + 2004\u20132023 monthly (20 yr context)<\/td><\/tr>\n<tr><td style=\"padding:14px 18px;font-weight:600;color:#2c3e50;border-bottom:1px solid #ecf0f1;\">Sources<\/td><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">ERA5 reanalysis \u00b7 Copernicus Marine WAVERYS \u00b7 IBTrACS typhoons \u00b7 Taiwan Central Weather Administration (CWA) OpenData<\/td><\/tr>\n<tr><td style=\"padding:14px 18px;font-weight:600;color:#2c3e50;\">Distribution<\/td><td style=\"padding:14px 18px;\">PUBLIC. \u00a9 2026 PF Tech Services Ltd. Methodology sample, not a project deliverable.<\/td><\/tr>\n<\/tbody><\/table>\n<p style=\"font-size:17px;font-weight:600;color:#5a7d6d;letter-spacing:1px;margin:36px 0 14px;padding-left:14px;border-left:4px solid #50B498;\">Five-number snapshot<\/p>\n<table style=\"width:100%;border-collapse:collapse;background:#fff;margin:14px 0;border-radius:4px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,0.05);\">\n<thead><tr><th style=\"padding:14px 18px;background:#50B498;color:#fff;font-weight:600;text-align:left;\">Metric<\/th><th style=\"padding:14px 18px;background:#50B498;color:#fff;font-weight:600;text-align:right;\">Value<\/th><th style=\"padding:14px 18px;background:#50B498;color:#fff;font-weight:600;text-align:left;\">Note<\/th><\/tr><\/thead>\n<tbody>\n<tr><td style=\"padding:14px 18px;font-weight:700;border-bottom:1px solid #ecf0f1;\">5-yr peak Hs<\/td><td style=\"padding:14px 18px;text-align:right;font-weight:700;color:#2c8568;border-bottom:1px solid #ecf0f1;\">6.25 m<\/td><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">NE-monsoon event (2020-12-30) \u2014 not a typhoon<\/td><\/tr>\n<tr><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">Strongest typhoon Hs (in window)<\/td><td style=\"padding:14px 18px;text-align:right;font-weight:700;color:#2c8568;border-bottom:1px solid #ecf0f1;\">5.14 m<\/td><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">Typhoon DOKSURI, July 2023<\/td><\/tr>\n<tr><td style=\"padding:14px 18px;font-weight:700;border-bottom:1px solid #ecf0f1;\">100 m mean wind speed<\/td><td style=\"padding:14px 18px;text-align:right;font-weight:700;color:#2c8568;border-bottom:1px solid #ecf0f1;\">9.98 m\/s<\/td><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">annual scalar mean (representative of large-rotor hub heights)<\/td><\/tr>\n<tr><td style=\"padding:14px 18px;font-weight:700;border-bottom:1px solid #ecf0f1;\">Standard-tier operability<\/td><td style=\"padding:14px 18px;text-align:right;font-weight:700;color:#2c8568;border-bottom:1px solid #ecf0f1;\">68% of the year<\/td><td style=\"padding:14px 18px;border-bottom:1px solid #ecf0f1;\">~248 days\/yr; Hs \u2264 2 m AND wind10 \u2264 12 m\/s<\/td><\/tr>\n<tr><td style=\"padding:14px 18px;\">Decadal-climatology check<\/td><td style=\"padding:14px 18px;text-align:right;font-weight:700;color:#2c8568;\">r \u2248 0.97<\/td><td style=\"padding:14px 18px;\">seasonal pattern matches; winter +0.4\u20130.7 m above 10-yr WW3<\/td><\/tr>\n<\/tbody><\/table>\n\n\n\n\n<h2 style=\"color:#2c3e50;font-size:28px;font-weight:700;margin:0 0 30px;display:inline-block;padding-bottom:8px;border-bottom:3px solid #50B498;\">What we found<\/h2>\n<p style=\"font-size:16px;line-height:1.7;margin:18px 0;\">The five top significant-wave-height (Hs) timestamps in the 2019\u20132023 5-year window \u2014 all between 5.95 m and 6.25 m \u2014 were direction-verified and partition-energy-confirmed as\u00a0<strong>northeast-monsoon events<\/strong>. They correspond to\u00a0<strong>three independent storm events<\/strong>\u00a0(one storm on 2023-10-05 contributes three consecutive 3-hourly samples). By comparison, the strongest named-typhoon site impact in the same window (Typhoon DOKSURI, July 2023) generated a peak Hs of 5.14 m.<\/p>\n<p style=\"font-size:16px;line-height:1.7;margin:18px 0;\"><strong>This is a within-window finding from a low-typhoon-activity sample, not a long-run climatological claim:<\/strong>\u00a0the 2019\u20132023 window was a period of below-average landfalling typhoon activity for Taiwan, and happens to contain no Cat 4+ typhoon passing the site at near-peak intensity. A longer (15\u201330 yr) analysis is recommended before drawing climatological conclusions about whether winter monsoon or direct-pass typhoons dominate extreme Hs at this site.<\/p>\n<p style=\"font-size:16px;line-height:1.7;margin:18px 0;\">For operability planning within the analysed window, sustained winter NE-monsoon conditions are at least as significant a constraint on offshore-wind installation, operations, and maintenance planning as direct typhoon passage was.<\/p>\n\n\n\n\n<h2 style=\"color:#2c3e50;font-size:28px;font-weight:700;margin:0 0 30px;display:inline-block;padding-bottom:8px;border-bottom:3px solid #50B498;\">How we know<\/h2>\n<h3 style=\"color:#34495e;font-size:18px;margin:50px 0 14px;padding-left:12px;border-left:4px solid #50B498;\">Seasonal cycle is dominated by the NE monsoon (2019\u20132023)<\/h3>\n\n<p style=\"font-size:14px;color:#555;background:#f8f9fa;border-left:3px solid #aaa;padding:14px 20px;margin:10px 0 0;line-height:1.6;\">Calendar heatmap of daily-mean 100 m wind speed at site 24.05\u00b0N 119.80\u00b0E, 2019\u20132023. Each year is one panel; columns within each panel represent week-of-year (labeled with month abbreviations); rows represent day-of-week. Deeper colour = stronger wind. The Oct\u2013Mar NE-monsoon dominance appears as the dark band recurring every year.<\/p>\n<h3 style=\"color:#34495e;font-size:18px;margin:50px 0 14px;padding-left:12px;border-left:4px solid #50B498;\">Typhoons in the 2019\u20132023 window did NOT directly drive the top Hs events<\/h3>\n\n<p style=\"font-size:14px;color:#555;background:#f8f9fa;border-left:3px solid #aaa;padding:14px 20px;margin:10px 0 0;line-height:1.6;\">Tracks of the six IBTrACS-catalogued tropical cyclones (lifetime peak intensity \u2265 Tropical Storm) that passed within 200 km of the site during 2019\u20132023. None of them generated a site Hs higher than the NE-monsoon top-five timestamps.<\/p>\n<h3 style=\"color:#34495e;font-size:18px;margin:50px 0 14px;padding-left:12px;border-left:4px solid #50B498;\">Joint Hs\u2013Tp distribution (2019\u20132023) shows the wind-sea regime<\/h3>\n\n<p style=\"font-size:14px;color:#555;background:#f8f9fa;border-left:3px solid #aaa;padding:14px 20px;margin:10px 0 0;line-height:1.6;\">Joint distribution of Hs and peak wave period at the site (2019\u20132023). Bulk of samples cluster at short period (5\u20137 s), consistent with locally-driven wind sea. The top-five Hs timestamps sit at the upper-right of the wind-sea cluster \u2014 high-Hs events with wind-sea spectral signatures, not long-period remote-typhoon swell.<\/p>\n<h3 style=\"color:#34495e;font-size:18px;margin:50px 0 14px;padding-left:12px;border-left:4px solid #50B498;\">Cross-validation against alternative-source 10-year wave hindcast<\/h3>\n\n<p style=\"font-size:14px;color:#555;background:#f8f9fa;border-left:3px solid #aaa;padding:14px 20px;margin:10px 0 0;line-height:1.6;\">Monthly Hs at site: WAVERYS 2019\u20132023 (5 yr) vs CWA WW3 2008\u20132017 (10 yr). Seasonal-cycle shape is consistent (12-month Pearson r \u2248 0.97) \u2014 supporting evidence that the WAVERYS site climatology used in this study captures the regional seasonal pattern.<\/p>\n\n\n\n\n<h2 style=\"color:#0d5fa1;font-size:24px;margin:0 0 24px;\">\u24d8 How to read this sample<\/h2>\n<p style=\"margin:20px 0;font-size:16px;line-height:1.7;\">This is a\u00a0<strong>methodology sample, not a project deliverable<\/strong>. Intended for prospective customers evaluating PF Tech's Level 1 Metocean Desktop Study service:<\/p>\n<ul style=\"padding-left:22px;font-size:16px;line-height:1.7;\">\n<li style=\"margin:14px 0;\"><strong>What this report shows<\/strong> \u2014 the analytical depth, framing, and limitations discipline of a PF Tech early-stage desktop study, demonstrated end-to-end on a representative point off Changhua.\u00a0<strong>The methodology and report structure are the durable contribution;\u00a0<\/strong>specific values are illustrative.<\/li>\n<li style=\"margin:14px 0;\"><strong>What it is good for<\/strong> \u00a0\u2014 early-phase site screening, technology selection, feasibility-stage scoping, and weather-window planning discussions with internal stakeholders.<\/li>\n<li style=\"margin:14px 0;\"><strong>What it is not<\/strong> \u00a0\u2014 a project-specific engineering input. The selection point is a methodology demonstrator, not an actual project location; values shown are not site-specific design figures.<\/li>\n<\/ul>\n<p style=\"margin:20px 0;font-size:16px;line-height:1.7;\">The full report \u2014 methodology, complete data sources, full caveats, partition-energy analysis, and reproducibility manifest \u2014\u00a0 <strong>PDF download below<\/strong>.\u00a0<\/p>\n\n\n\n\n<h3 style=\"color:#fff;margin:0 0 18px;font-size:22px;\">\ud83d\udcc4 See the full deliverable<\/h3>\n<p style=\"color:rgba(255,255,255,0.92);margin:14px 0;font-size:15px;\">The complete bilingual report \u2014 methodology, data sources, partition-energy analysis, reproducibility manifest.<\/p>\n<p style=\"margin:14px 0;\"><a href=\"https:\/\/pft-s.com.tw\/wp-content\/uploads\/2026\/05\/PFT-MS-001-zh.pdf\" target=\"_blank\" style=\"display:inline-block;padding:12px 24px;margin:8px 8px 8px 0;background:#fff;color:#2c8568;text-decoration:none;border-radius:4px;font-weight:600;font-size:14px;\">Download Full PDF (Traditional Chinese)<\/a><a href=\"https:\/\/pft-s.com.tw\/wp-content\/uploads\/2026\/05\/PFT-MS-001.pdf\" target=\"_blank\" style=\"display:inline-block;padding:12px 24px;margin:8px 0 8px 0;background:transparent;color:#fff;text-decoration:none;border:2px solid #fff;border-radius:4px;font-weight:600;font-size:14px;\">Download English PDF<\/a><\/p>\n\n\n<h3 style=\"color:#fff;margin:0 0 18px;font-size:22px;\">\u2709 Looking to commission a similar study?<\/h3>\n<p style=\"color:rgba(255,255,255,0.92);margin:14px 0;font-size:15px;\">Whether your project is offshore site assessment, port planning, or any other application requiring integrated metocean, wind, or typhoon-exposure analysis \u2014 we tailor delivery to your site.<\/p>\n<p style=\"margin:14px 0 0 0;\"><a href=\"mailto:contact@pft-s.com.tw\" style=\"display:inline-block;padding:12px 24px;background:#fff;color:#2c8568;text-decoration:none;border-radius:4px;font-weight:600;font-size:14px;\">CONTACT<\/a><br><span style=\"display:inline-block;margin-top:8px;color:rgba(255,255,255,0.85);font-size:13px;\">Or email us directly at\u00a0 <a href=\"mailto:contact@pft-s.com.tw\" style=\"color:#fff;text-decoration:underline;\">contact@pft-s.com.tw<\/a><\/span><\/p>\n\n\n\n\n\n<h3 style=\"color:#bdc3c7;font-size:18px;font-weight:600;margin:0 0 16px;\">Disclaimer<\/h3>\n<p style=\"color:#95a5a6;font-size:14px;line-height:1.7;margin:14px 0;\">This page summarises a methodology sample. It does not constitute a design basis for any specific wind farm, port facility, or coastal asset. PF Tech makes no representation about whether the selection point falls within any specific operating or planned project area. The full Disclaimer is on page 3 of the PDF.<\/p>\n<p style=\"color:#95a5a6;font-size:14px;line-height:1.7;margin:14px 0;\">PF Tech Services Ltd. \u2014 \u6c9b\u98a8\u79d1\u6280\u670d\u52d9\u6709\u9650\u516c\u53f8. \u00a9 2026 PF Tech Services Ltd. All rights reserved.<\/p>\n<p style=\"color:#95a5a6;font-size:13px;line-height:1.7;margin:14px 0;\">Data attribution: ERA5 (CC-BY 4.0 Copernicus Climate Change Service), Copernicus Marine WAVERYS (CMEMS Licence), IBTrACS (NOAA NCEI public domain), CWA OpenData (Open Government Data License v1). Full attribution and DOIs in \u00a79 of the PDF.<\/p>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":306,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"class_list":["post-283","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/pages\/283","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/comments?post=283"}],"version-history":[{"count":15,"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/pages\/283\/revisions"}],"predecessor-version":[{"id":319,"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/pages\/283\/revisions\/319"}],"up":[{"embeddable":true,"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/pages\/306"}],"wp:attachment":[{"href":"https:\/\/pft-s.com.tw\/en\/wp-json\/wp\/v2\/media?parent=283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}