改进突变模型在河流健康评价中的应用

Application of Improved Catastrophe Model in River Health Evaluation

为了直观地从评估值看出河流健康状态,提出等级指示值和河流等级类别指标值改进突变模型。根据河流受人类社会活动负面影响的程度和流域规模将河流划分为四类三级,构建河流健康评价指标体系和不同等级类别的评价标准,提出河流等级类别指示值改进最终结果,并运用改进的突变模型对潮田河进行健康评价。结果表明:潮田河健康综合评价结果为-0.029C2,河流属于县级Ⅱ类,处于亚健康状态;潮田河正从亚健康向基本健康状态转变,实施河湖长制以来潮田河健康状况越来越好;河流形态结构完整性问题突出,建议加强对河流水工建筑物或设施的改造,增添鱼类洄游通道并保证其能正常运行。

In order to see the health status of the river from the evaluation value visually and accurately,an improved mutation model of the grade indicator value was proposed to unify the health grade threshold of all indicators.According to the degree of the negative impact of human social activities and the scale of the river basin,the rivers were divided into four types and three grades.The river health evaluation index system and the scoring standards of different grades had been constructed and then the river grade and type indicator value were proposed to improve the end result.The improvement mutation model was used to evaluate the health of Chaotian River.The results show that the final result of the comprehensive health evaluation of Chaotian River is-0.029 C2,and the river belongs to the county-level classⅡand in the sub-health state.The Chaotian River is changing from the sub-healthy state to the state of basic health.The health of Chaotian River has been getting better and better since the implementation of the river and lake chief system.The issue of the integrity of river morphology and structure is prominent.Therefore,it is recommended strengthening river hydraulic structures or facilities of the transformation,increasing channels for fish migration and ensuring their normal operation.