Optimal control problem arises from illegal poaching of southern white rhino mathematical model

Advances in Difference Equations

article

Aldila, Dipo¹  Azizah, Nadhira¹  Handari, Bevina D.¹ 

[1] Department of Mathematics, Universitas Indonesia

关键词: Southern white rhino;    Illegal hunter;    Predator–prey model;    Optimal control problem;   

DOI  :  10.1186/s13662-020-03062-5

学科分类：航空航天科学

来源: SpringerOpen

【 摘 要 】

In this paper, a novel dynamical population model of a southern white rhino with legal and illegal poaching activity is introduced. The model constructed is based on a predator–prey model with southern white rhinos as prey and humans (hunters) as predators. We divide the southern white rhino population into three classes based on their horn condition. We investigate the existence and the stability of the equilibrium points, which depend on some threshold functions. From an analytical result, it is trivial that arresting as many hunters as possible helps conserve white rhinos, but it comes at a high cost. Therefore, an optimal strategy is needed. The optimal control is then constructed using Pontryagin’s minimum principle and solved numerically with an iterative forward–backward method. Optimal control simulations are given to provide additional insight into the dynamics of the model. Analysis of the cost function effectiveness is conducted using the ACER (Average Cost–Effectiveness Ratio) and ICER (Incremental Cost–Effectiveness Ratio) indicator method. The results show that the hunter population can be more easily controlled with a time-dependent hunter arrest rate rather than by treating it as a constant.

【 授权许可】

CC BY