These equations are verified by the measure data in nantong section in yangtse river , and the results are satisfied . on the base of the vertical mixing law , the part depth homogeneous mixing 2d numerical model has been developed , and it was used in the concentration field calculation . by use of the measure data of rbodemine - b tracer in yangtse river estuary , the comparison of value calculated with data measured has been made 该模型去掉了传统的全场水深平均二维模型污染源一出排放口便在水深方向上均匀混合的假设，而将计算水域划分为污染物浓度在垂向上达到部分水深均匀混合及全水深均匀混合两个区域，并将上述有关部分水深均匀混合及全水深均匀混合的基本规律的研究成果应用该模型中。
By the theoretical derivation , the equation of the vertical homogeneous mixing distance of the continuous and instantaneous point source is developed . the definition of the part depth of homogeneous mixing is given , and its equation is obtained . these equations are verified by the measure data , such as the data of nanjing section in yangtse river , and the results are satisfied 通过理论推导，分别得到瞬时点源和连续点源浓度场在垂向上达到全水深均匀混合的纵向距离的理论计算公式；进一步研究排放口至全水深均匀混合距离之间水域的污染物垂向紊动混合过程，首次提出了部分均匀混合水深的新概念，推导得到部分均匀混合水深随纵向距离变化规律的表达式。
The iea is applied to the study of the discharge port optimization planning and the application shows that this algorithm not only achieves good results , but also successfully solves the problems such as nonlinear objective function , complicated constraint condition and dimension disasters in it 把该算法应用于排放口最优规划，结果表明：免疫进化算法不仅取得了良好的应用效果，而且成功地解决了此类问题中存在的非线性目标函数、约束条件过于复杂、 “维数灾”等问题。
Following this , an extensive public sewer connection programme in the area was carried out . for a while , rocky bay was the sole exception to the trend described above , partly due to a large area of unsewered village houses close by . however , after drainage improvements diverted waste water outlets further away from the beach , it finally achieved wqo compliance in 1999 and since then has consistently met the wqo threshold 尽管南区泳滩的水质在1990年代后期已普遍改善，但石澳后滩的水质仍然欠佳，主要是因为附近还有许多村屋尚未接驳到公共污水系统，其后政府进行了排水系统改善工程将污水排放口改道至远离泳滩的地方，石澳后滩终于在1999年达到水质指标，自此更一直没有出现超出指标的情况。
