MARHYD: Magdalena River Hydrodynamic model in Delft3D. Results of Case 2 (water velocity)

This database contains output files of MARHYD: the MAgdalena River HYdrodynamic model in Delft3D. Model description: The model domain of MARHYD extends from coordinates 10.9619 °N to 11.2669° N and from 74.7571 °W to 74.8784 °W. This domain includes the last 22 km of the river and estuary before discharging into the Caribbean Sea and 63 km by 37 km of the surrounding coastal region in east-west and north-south directions. In oceanic waters, the model is rectangular, configured on a 150 m x 150 m horizontal resolution near the open boundaries, with a gradual refinement to 50 m x 50 m near the river mouth. In the river and estuary, the model is curvilinear, with 10 horizontal cells in the transversal section, reaching a variable size between 40 m to 100 m. 40 Z-layers represent the water column with a higher resolution close to the surface. Layers of approximately 0.5 m cover the upper 10 m of the water columns, where most of the mixing processes between the river and the ocean occur. The vertical resolution reduces progressively from 10 m depth to the bottom. The boundary conditions of salinity and currents with the Caribbean Sea (at the North, East, and West) were obtained from HYCOM + NODA reanalysis every 6 hours, and wind velocity was obtained from CFSR-NCEP/NCAR reanalysis every 1 hour for the wind stress. The bathymetry was derived from GEBCO, Nautical charts of the Maritime Directorate of Colombia (DIMAR), and high-resolution in-situ measurements. River discharge data were obtained from the nearest upstream hydrological station of the Magdalena River. The model was calibrated and validated using field data of salinity profiles along the river estuary and plume, velocity measurements in the river and estuary, and water level in the estuary for two climatic seasons. Description of simulation case: Case 2 corresponds to a mid-discharge scenario with Q = 6800 m^3/s, equivalent to the 50th percentile of the historical freshwater flow. Water currents, salinity and water level in the open boundaries correspond to the time-average of HYCOM Reanalysis database for the dates between 9th and 29th of November of 2017. Winds are constant with a speed of 11.3 m/s from the Northeast. The full set of input (configuration) files of this simulation can be found in the dataset: Álvarez-Silva, Óscar; Barros, Yennis ; Saavedra, Victor; Cardona, Yuley; Cáceres-Euse, Alejandro; Osorio, Andres F.; Arbeláez, Felipe (2021), “MARHYD: Magdalena River Hydrodynamic model in Delft3D. Inputs of cases 1 and 2”, Mendeley Data, V2, doi: 10.17632/hmhdvg47kg.2 Files description: This dataset includes the water velocity results for the entire computational domain, every 8 hours, during 20 days of simulation. ​ The data are in .nc format. Results of salinity and water level for this simulation case can be found in the database: MARHYD: Magdalena River Hydrodynamic model in Delft3D. Results of Case 2 (salinity and water level), doi: 10.17632/r99xkp2czc.2

本数据库包含马格达莱纳河水动力模型MARHYD（Magdalena River Hydrodynamic Model）的输出文件，该模型基于Delft3D平台搭建。
模型说明：MARHYD的模型范围覆盖北纬10.9619°至11.2669°、西经74.7571°至74.8784°的区域，包含注入加勒比海前最后22公里的河道与河口区域，以及东西向63公里、南北向37公里的周边近岸海域。在开阔海域，模型采用矩形网格：开边界附近水平分辨率为150 m×150 m，向河口方向逐渐加密至50 m×50 m；在河道与河口区域，模型采用曲线网格，横断面包含10个水平网格单元，网格尺寸在40 m至100 m之间动态变化。水体垂向采用40层Z坐标分层，表层附近分辨率更高：表层10米范围内采用约0.5米的分层厚度，该区域是河海混合过程的主要发生区；从10米水深至海底，垂向分辨率随深度增加逐渐降低。加勒比海（北、东、西三侧）的盐度与流场边界条件来自HYCOM + NODA再分析数据，时间分辨率为6小时；风应力所需的风速数据来自CFSR-NCEP/NCAR再分析数据，时间分辨率为1小时。水深地形数据来源于GEBCO全球水深图、哥伦比亚海事总局（DIMAR）海图以及高分辨率现场实测数据。马格达莱纳河的径流数据取自河道上游最近的水文站。模型通过两个气候季节的实测数据进行率定与验证，实测数据包括河口及羽流区的盐度剖面、河道与河口的流速测量值以及河口水位数据。
模拟案例说明：案例2对应中等径流情景，径流量Q=6800 m³/s，等同于历史淡水径流量的50分位值。开边界的流场、盐度与水位数据采用2017年11月9日至29日的HYCOM再分析数据的时间平均值；风场设置为恒定东北向风，风速为11.3 m/s。本模拟的全套输入（配置）文件可在以下数据集获取：Álvarez-Silva, Óscar; Barros, Yennis; Saavedra, Victor; Cardona, Yuley; Cáceres-Euse, Alejandro; Osorio, Andres F.; Arbeláez, Felipe (2021), "MARHYD: 基于Delft3D的马格达莱纳河水动力模型——案例1与案例2输入文件", Mendeley Data, V2, doi: 10.17632/hmhdvg47kg.2
文件说明：本数据集包含模拟时长20天内、每8小时输出一次的全计算域水流速度结果，数据格式为.nc文件。本案例的盐度与水位结果可在以下数据库获取："MARHYD: 基于Delft3D的马格达莱纳河水动力模型——案例2（盐度与水位）结果", doi: 10.17632/r99xkp2czc.2