设置污染物降解系数，数据类型分为常量值和时间序列两种

{
    "modelFile": "C:\\Work\\DevCoreAzure\\TestData\\Service\\MIKE21FM\\FunningsFjord\\FunningsFjord.m21fm",
    "decays": [
        {
            "componentNo": 0,
            "componentName": "Conservative Comp.",
            "includeDecay": true,
            "dataFormat": 0,
            "constant": 0.88,
            "timeSeries": null
        },
        {
            "componentNo": 1,
            "componentName": "Decaying Comp.",
            "includeDecay": true,
            "dataFormat": 0,
            "constant": 0.99,
            "timeSeries": null
        }
    ]
}