{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# OpenBergOld - statistical mode\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "from datetime import datetime, timedelta\nfrom opendrift.readers import reader_netCDF_CF_generic\nfrom opendrift.readers import reader_current_from_track\nfrom opendrift.models.openberg_old import OpenBergOld"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Create observation of iceberg track\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "obslon = [3.1, 3.123456]\nobslat = [61.1, 61.132198]\nobstime = [datetime(2015, 11, 16, 0), datetime(2015, 11, 16, 6)]"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Initialize model\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "steps = 60   # This is the number of forecast steps\no = OpenBergOld(loglevel=30)  # Basic drift model suitable for icebergs"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Preparing Readers\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "reader_wind = reader_netCDF_CF_generic.Reader(o.test_data_folder() +\n   '16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc',name='WIND')\n\nreader_current = reader_current_from_track.Reader(\n    obslon, obslat, obstime, wind_east=0, wind_north=0,\n    windreader=reader_wind, wind_factor=0.018)\n\no.add_reader([reader_current, reader_wind])"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Seeding elements\n\nIcebergs are moved with the ocean current as per Barker et al (2004),\nin addition to a fraction of the wind speed (wind_drift_factor).\nThis factor depends on the properties of the elements.\nDefault empirical values are:\n- Wind drift fraction: 0.018 (1.8 %) (Garret 1985)\n- Iceberg size: Keel dept = 60m\nWaterline length = 90.5m\nNB! Iceberg size is irrelevant for current_reader with 1D z-profile\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o.seed_elements(3.3, 61.3, radius=3000, number=500,\n                time=reader_current.start_time)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Run model\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "print('Starting free run .../n')\n\nprint('Start time: ' + str(o.start_time))\n\no.run(time_step=3600, steps=steps)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Print and plot results\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o.plot(fast=True)\no.animation(fast=True)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "<img src=\"file://gallery/animations/example_openberg_stat_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
}