コード例 #1
0
        //---------------------------------------------------------------------

        /// <summary>
        /// Removes the cohorts which are damaged by a disturbance.
        /// </summary>
        public void DamageBy(ICohortDisturbance disturbance)
        {
            //  Go backwards through list of ages, so the removal of an age
            //  doesn't mess up the loop.
            isMaturePresent = false;
            for (int i = ages.Count - 1; i >= 0; i--)
            {
                ICohort cohort = new Cohort(species, ages[i]);
                if (disturbance.Damage(cohort))
                {
                    ages.RemoveAt(i);
                    Cohort.Died(this, cohort, disturbance.CurrentSite,
                                disturbance.Type);
                }
                else if (ages[i] >= species.Maturity)
                {
                    isMaturePresent = true;
                }
            }
        }
コード例 #2
0
        //---------------------------------------------------------------------

        /// <summary>
        /// Grows all the cohorts by advancing their ages.
        /// </summary>
        /// <param name="years">
        /// The number of years to advance each cohort's age.
        /// </param>
        /// <param name="successionTimestep">
        /// Indicates whether the current timestep is a succession timestep.
        /// If so, then all young cohorts (i.e., those whose ages are less than
        /// or equal to the succession timestep are combined into a single
        /// cohort whose age is the succession timestep.
        /// </param>
        /// <param name="site">
        /// The site where the cohorts are located.
        /// </param>
        public void Grow(ushort years,
                         ActiveSite site,
                         int?successionTimestep)
        {
            //  Update ages
            for (int i = 0; i < ages.Count; i++)
            {
                if (successionTimestep.HasValue && (ages[i] < successionTimestep.Value))
                {
                    // Young cohort
                    ages[i] = (ushort)successionTimestep.Value;
                }
                else
                {
                    ages[i] += years;
                }
            }

            //  Combine young cohorts if succession timestep
            if (successionTimestep.HasValue)
            {
                //  Go backwards through list of ages, so the removal of an age
                //  doesn't mess up the loop.
                bool left1YoungCohort = false;
                for (int i = ages.Count - 1; i >= 0; i--)
                {
                    if (ages[i] == successionTimestep.Value)
                    {
                        // Young cohort
                        if (left1YoungCohort)
                        {
                            ages.RemoveAt(i);
                        }
                        else
                        {
                            left1YoungCohort = true;
                        }
                    }
                }
            }

            //  Now go through ages and check for age-related mortality and
            //  senescence.  Again go backwards through the list, so the
            //  removal of an age doesn't mess up the loop.
            isMaturePresent = false;
            for (int i = ages.Count - 1; i >= 0; i--)
            {
                bool   cohortDies = false;
                ushort age        = ages[i];
                if (age > species.Longevity)
                {
                    cohortDies = true;
                }
                else if (age >= 0.8 * species.Longevity)
                {
                    //  Below is the annual age-related mortality probability,
                    //  so we need to check it for each year of growth.
                    double ageRelatedMortalityProb = (4 * ((double)age / species.Longevity) - 3) / 10;
                    for (int j = years; j > 0; j--)
                    {
                        if (Landis.Util.Random.GenerateUniform() < ageRelatedMortalityProb)
                        {
                            cohortDies = true;
                            break;
                        }
                    }
                }
                if (cohortDies)
                {
                    ages.RemoveAt(i);
                    Cohort.Died(this, new Cohort(species, age), site, null);
                }
                else if (age >= species.Maturity)
                {
                    isMaturePresent = true;
                }
            }
        }