设置水动力初始条件，包括初始高程、初始流速，数据类型仅支持常量值

{
    "modelFile": "C:\\Work\\DevCoreAzure\\TestData\\Service\\MIKE21FM\\Structure\\Sim1_Weir.m21fm",
    "initialConditionType": 1,
    "initialSurfaceElevation": 22,
    "initialUVelocity": 33,
    "initialVVelocity": 44
}