论文部分内容阅读
(一)前言水文年鉴编印规范(SD244-87)提出水位流量关系稳定的测站,可拟合曲线选配数学模型以推求测站的过站流量。实际中,常用多项式Q=a_0+a_1Z+a_2Z~2+……+a_nZ~k拟合水位流量关系曲线。其中a_0、a_1、a_2……a_k是从n对水位流量测点(Z_i、Q_i) (i=1～n)拟合的过程中求得。应用多项式拟合水位流量关系曲线时,阶数K的选取是极重要的。阶数选取得合适与否决定于水位流量关系测点的离散程度,并直接影响到推流的精度。若所用的多项式
(I) Preface The Yearbook of Hydrology Yearbook (SD244-87) proposes a stable station with stable water level and flow rate, and can fit the mathematic model of curve selection to estimate the station over-flow rate. In practice, the common polynomial Q = a_0 + a_1Z + a_2Z ~ 2 + ...... + a_nZ ~ k fitting water level flow curve. Where a_0, a_1, a_2 ...... a_k is obtained from the process of fitting n to the measurement points (Z_i, Q_i) of water level (i = 1 ~ n). When polynomial is used to fit the water level and flow rate curve, the choice of order K is very important. The choice of order is appropriate or not depends on the relationship between water level flow measurement points discrete degree, and a direct impact on the accuracy of the flow. If the polynomial used