/// <summary>
/// 计算实测单元流量
/// </summary>
/// <param name="src">参与计算的数据</param>
/// <param name="boatVelocity">船速(地理坐标系下)</param>
/// <param name="dTime">时间差</param>
/// <returns>单元流量信息集合</returns>
public EnsembleFlowInfo CalculateEnsembleFlow(ArrayClass src, EarthVelocity boatVelocity, double dTime)
{
EnsembleFlowInfo ensembleFlow = new EnsembleFlowInfo();
ensembleFlow.Valid = false;
if (Math.Abs(boatVelocity.EastVelocity) > 80 ||
Math.Abs(boatVelocity.NorthVelocity) > 80)
{
return(ensembleFlow);
}
//单元大小
double Da = src.A_CellSize;
if (Da < 1e-6)
{
return(ensembleFlow);
}
//底跟踪四个波束中的最小深度
double Dmin = double.NaN;
//计算四个波束的平均深度
int num = 0;
double depthSum = 0;
foreach (double d in src.B_Range)
{
if (d < 1e-6)
{
continue;
}
if (double.IsNaN(Dmin))
{
Dmin = d;
}
else
{
if (d < Dmin)
{
Dmin = d;
}
}
num++;
depthSum += d;
}
if (num == 0)
{
return(ensembleFlow);
}
double Davg = depthSum / num;
//有效单元的可能最大深度
double DLGmax = Dmin * Math.Cos(beamAngle / 180.0 * Math.PI) + draft - Math.Max((pulseLength + pulseLag) / 2.0, Da / 2.0);
//水面到水底的距离
double Dtotal = Davg + draft;
//第一个有效单元
MeasuredBinInfo firstValid = new MeasuredBinInfo();
firstValid.Status = BinFlowStatus.Bad;
//最后一个有效单元
MeasuredBinInfo lastValid = new MeasuredBinInfo();
//单元深度
double binDepth = src.A_FirstCellDepth + draft;
//实测累计流量
double SumMeasuredFlow = 0;
//累计东向水速
double SumEastVelocity = 0;
//累计北向水速
double SumNorthVelocity = 0;
//GoodBin个数
int GoodBinCount = 0;
List <MeasuredBinInfo> binsInfoArray = new List <MeasuredBinInfo>();
// 保存有效单元的索引号
List <int> validBinsIndex = new List <int>();
for (int i = 0; binDepth < DLGmax && i < src.E_Cells && i * 4 < src.Earth.Length; i++, binDepth += Da)
{
//获取矢量交叉乘积
double xi = CrossProduct(src.Earth[0, i], src.Earth[1, i], boatVelocity.EastVelocity, boatVelocity.NorthVelocity);
MeasuredBinInfo binInfo = new MeasuredBinInfo();
binInfo.Depth = binDepth;
binInfo.Flow = xi * dTime * Da;
binInfo.Status = (IsGoodBin(src, i) ? BinFlowStatus.Good : BinFlowStatus.Bad);
binsInfoArray.Add(binInfo);
if (binInfo.Status == BinFlowStatus.Good)
{
if (firstValid.Status == BinFlowStatus.Bad)
{
firstValid = binInfo;
}
lastValid = binInfo;
SumMeasuredFlow += binInfo.Flow;
SumEastVelocity += src.Earth[0, i];
SumNorthVelocity += src.Earth[1, i];
GoodBinCount++;
//保存一个有效单元索引
validBinsIndex.Add(i);
}
}
ensembleFlow.BinsInfo = binsInfoArray.ToArray();
if (firstValid.Status == BinFlowStatus.Bad)
{
return(ensembleFlow);
}
//第一个有效单元的深度
double Dtop = firstValid.Depth;
//最后一个有效单元的深度
double Dlg = lastValid.Depth;
double Z3 = Dtotal;
double Z2 = Dtotal - Dtop + Da / 2.0;
double Z1 = Dtotal - Dlg - Da / 2.0;
//实测流量
ensembleFlow.MeasuredFlow = dTime * (Z2 - Z1) * CrossProduct(SumEastVelocity / GoodBinCount, SumNorthVelocity / GoodBinCount,
boatVelocity.EastVelocity, boatVelocity.NorthVelocity);
//顶部流量
switch (topMode)
{
case TopFlowMode.Constants:
ensembleFlow.TopFlow = firstValid.Flow / Da * (Z3 - Z2);
break;
case TopFlowMode.PowerFunction:
{
double a = exponent + 1;
ensembleFlow.TopFlow = SumMeasuredFlow * (Math.Pow(Z3, a) - Math.Pow(Z2, a)) / (Math.Pow(Z2, a) - Math.Pow(Z1, a));
}
break;
case TopFlowMode.Slope:
{
//用于外延计算的 validbins 数量不足，则降为常数法计算
if (validBinsIndex.Count < 6)
{
ensembleFlow.TopFlow = firstValid.Flow / Da * (Z3 - Z2);
break;
}
else
{
// validbin 的信息，三个列表是索引对应同一个 validbin
// 每个 validbin 的深度信息
List <double> binsDepth = new List <double>();
// 每个 validbin 的东向速度
List <double> binsEastVelocity = new List <double>();
// 每个 validbin 的北向速度
List <double> binsNorthVelocity = new List <double>();
for (int i = 0; i < 3; i++)
{
// validbin 索引号
int bin_index = validBinsIndex[i];
// validbin 深度（从水面起）
double bin_depth = src.A_FirstCellDepth + draft + bin_index * Da;
// 东向和北向速度
double bin_east_vel = src.Earth[0, bin_index];
double bin_north_vel = src.Earth[1, bin_index];
//加入列表
binsDepth.Add(bin_depth);
binsEastVelocity.Add(bin_east_vel);
binsNorthVelocity.Add(bin_north_vel);
}
// 外延计算
// 外延的深度位置（从水面起算）
double dep = (Z3 - Z2) / 2;
// 外延计算东向速度
Slope east_slope = new Slope();
east_slope.setXYs(binsDepth.ToArray(), binsEastVelocity.ToArray());
double east_vel;
try
{
east_vel = east_slope.calY(dep);
} // 外延失败，斜角为90度，转而采用常数法
catch (DivideByZeroException)
{
ensembleFlow.TopFlow = firstValid.Flow / Da * (Z3 - Z2);
break;
}
//外延计算北向速度
Slope north_slope = new Slope();
north_slope.setXYs(binsDepth.ToArray(), binsNorthVelocity.ToArray());
double north_vel;
try
{
north_vel = north_slope.calY(dep);
} // 外延失败，斜角为90度，转而采用常数法
catch (DivideByZeroException)
{
ensembleFlow.TopFlow = firstValid.Flow / Da * (Z3 - Z2);
break;
}
// 计算流量
ensembleFlow.TopFlow = dTime * (Z3 - Z2) * CrossProduct(east_vel, north_vel,
boatVelocity.EastVelocity, boatVelocity.NorthVelocity);
break;
}
}
default:
break;
}
//底部流量
switch (bottomMode)
{
case BottomFlowMode.Constants:
ensembleFlow.BottomFlow = lastValid.Flow / Da * Z1;
break;
case BottomFlowMode.PowerFunction:
{
double a = exponent + 1;
ensembleFlow.BottomFlow = SumMeasuredFlow * Math.Pow(Z1, a) / (Math.Pow(Z2, a) - Math.Pow(Z1, a));
}
break;
default:
break;
}
ensembleFlow.Valid = true;
return(ensembleFlow);
}