The study proposes an enhanced method of computing wind drag coefficient (C_d) for extreme hurricane wind conditions which can be applied to precisely estimate the hurricane induced storm wave and surge. Thirty different tropical cyclone/hurricane conditions were chosen and modeled using the enhanced Wave Boundary Layer Model (WBLM) to estimate C_d based on air-sea interaction concept and are then subjected to polynomial regression with wind speed as an independent and C_d as the dependent variable. An improved wind drag (IWD) method (cubic function) that matches the WBLM's pattern at all simulated wind speeds was established. To evaluate the performance of the IWD method, it was used to simulate storm wave and surge levels for Hurricanes Katrina, Rita and Michael, along with two other widely used wind drag methods (Garratt, 1977 and Zijlema et al., 2012). Katrina, Rita and Michael were chosen for their extreme wind intensity, the surge that they induced along their landfall regions and also the field data availability. The simulations were carried out using a coupled model to compute the wave heights and water levels, which were further compared and validated with the field measurements. A detailed analysis of the modeled results conveys the fact that the proposed IWD method performs better than the other two methods in accurate estimation of significant storm wave heights and peak surge levels. Hence, the study recommends the IWD method for computing C_d at extreme wind conditions up to 90 m/s.

这项研究提出了一种增强的方法，用于计算极端飓风条件下的风阻系数（C _d），可用于精确估算飓风诱发的风暴波和浪涌。选择了30种不同的热带气旋/飓风条件，并使用增强的波边界层模型（WBLM）进行了建模，以基于海-气相互作用概念估算C _d，然后将其作为风速和C _d进行多项式回归作为因变量。建立了一种在所有模拟风速下都与WBLM模式匹配的改进的风阻（IWD）方法（三次函数）。为了评估IWD方法的性能，它被用来模拟卡特里娜飓风，丽塔和迈克尔飓风的风暴波和浪涌水平，以及其他两种广泛使用的风阻方法（Garratt，1977； Zijlema等，2012）。选择卡特里娜飓风，丽塔（Rita）和迈克尔（Michael）是因为他们的极端风强度，沿登陆区引起的浪涌以及现场数据的可用性。使用耦合模型进行了仿真，以计算波高和水位，并与现场测量结果进行了进一步比较和验证。对模型结果的详细分析传达了以下事实：拟议的IWD方法在准确估计重大风暴波高度和峰值浪涌水平方面比其他两种方法表现更好。因此，研究建议使用IWD方法计算C_d在高达90 m / s的极端风条件下。