Marine population dynamics problem

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Marine population dynamics problem
State dimension: 1
Differential states: n_2

The Marine population dynamics problem estimates growth and mortality rates of a marine species at each stage (for example ages or development stage) given the population as a function of time.( Problem taken from the COPS library)


Mathematical formulation

The problem is given by


\begin{array}{llcl}
 \displaystyle \min_{g_j, m_j} & \sum\limits_{j=1}^{n_m} &&||y(\tau_j; m, g) - z_j||^2   \\[1.5ex]
 \mbox{s.t.} 
 & \dot{y}_j & = &  g_{j-1} y_{j-1} - (m_j + g_j) y_j \quad \forall j \in 1, ..., n_s,\\
 & g_j, m_j &\in&  [0,1].
\end{array}

where  g_j and  m_j are the growth and mortality rates at stage  j respectively and the initial conditions are unknown. The error between computed and observed data is minimized.

Parameters

There are  n_s stages and  n_m timepoints at which the error is minimized.


Source Code

Model descriptions are available in