Tính toán chiều cao sóng ý nghĩa bằng phương pháp tham số
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Abstract
Representative wave and parametric wave approaches are popular methods for computing wave height. However, the representative wave method showed low accuracy for computing significant wave height. In contrast, the parametric wave approach performs well in root-mean-square wave height transformation. Therefore, this paper investigates feasibility of applying a parametric wave model to calculate significant wave height. Six parametric wave models are collected to examine their accuracy for modeling considerable wave height, and these models are modified to improve prediction performance. A large amount of wave data is gathered for examination and calibration. The results show that the existing models predict significant wave height with a root-mean-square relative error of 9,9%-16,6%. After modifying them, the error ranges from 6,4%-9,5%. Among the six models, DT23 performs the best result for significant wave height transformation prediction. These six models are tested with other data to verify the wave height estimation capacity. The verification results indicate a significant decrease in error. Therefore, DT23 with modification is recommended for computing significant wave height transformation.
Tóm tắt
Sóng đại diện và tham số là hai phương pháp phổ biển tính chiều cao sóng biển. Phương pháp sóng đại diện có độ chính xác thấp khi tính chiều cao sóng ý nghĩa. Tuy nhiên, phương pháp tham số cho kết quả tốt khi tính chiều cao sóng căn quân phương. Do đó, nghiên cứu này sẽ kiểm tra tính khả thi của việc sử dụng phương pháp tham số để tính chiều cao sóng ý nghĩa. Số lượng lớn số liệu sóng và sáu công thức của phương pháp tham số được thu thập để kiểm tra khả năng tính chiều cao sóng ý nghĩa và hiệu chỉnh hệ số để nâng cao khả năng tính. Kết quả cho thấy, sai số tính chiều cao sóng từ 9,9% đến 19,6%. Tuy nhiên, sai số chỉ còn từ 6,4% đến 9,5% sau khi hiệu chỉnh hệ số và công thức DT23 cho sai số tốt nhất. Để kiểm tra lại khả năng tính toán, bộ số liệu kiểm tra được sử dụng và kết quả cho thấy sai số đã giảm đáng kể khi hiệu chỉnh hệ số. Do đó, DT23 được đề xuất để tính chiều cao sóng ý nghĩa.
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