{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Static 2D current field\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "from datetime import datetime, timedelta\nimport numpy as np\n\nfrom opendrift.readers.reader_constant_2d import Reader\nfrom opendrift.models.oceandrift import OceanDrift"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Constructing a static, rotating ocean current field, \n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "lon, lat = np.meshgrid(np.linspace(2,6,30), np.linspace(59,62,30))\nlon0 = 4\nlat0 = 60.5\nu = -(lat-lat0)/np.sqrt((lon-lon0)**2 + (lat-lat0)**2)\nv = (lon-lon0)/np.sqrt((lon-lon0)**2 + (lat-lat0)**2)\nlon = np.linspace(0,5,30)\nlat = np.linspace(59,62,30)\n\nr = Reader(x=lon, y=lat, proj4='+proj=latlong',\n           array_dict = {'x_sea_water_velocity': u, 'y_sea_water_velocity': v})\n\no = OceanDrift(loglevel=20)\no.set_config('environment:fallback:land_binary_mask', 0)\no.add_reader(r)\no.seed_elements(lon=3, lat=60.5, number=1000, radius=30000, time=datetime.now())\no.run(duration=timedelta(hours=72))\no.animation(fast=True)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "<img src=\"file://gallery/animations/example_static_2d_current_0.gif\">\n\n"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.11.6"
    }
  },
  "nbformat": 4,
  "nbformat_minor": 0
}