汇水面积

处理滇池流域重现期为5a的单场降雨，试验床体面积占汇水面积的比例>3.7%时，芦苇床湿地对总磷的去除率高达92%，对总氮的去除率为63%；

Using the Phragmites communis , the removal rates of TP , TN reach 92 % and 63 % respectively when the storm recurrence interval is 5 years and the treatment system area occupies above 3.7 % of the catchment area .

在路线所经过水系位置设置出水口，TOPAZ模型可确定路线局部汇水面积，可初步计算得出该段排水设施的设计流量；结合WMS的HY-8模型，对设施进行水力分析计算。

Set the water outlet along the route pass by , the TOPAZ model can determine the catchment area of the line , so it is easy to calculate the preliminary design of drainage facilities , combined with the HY-8 models , complete hydraulic analysis of the facilities .

结果表明，发生浅沟侵蚀的临界坡度约为18°，临界坡长为40m左右，临界汇水面积约为650m~2。

Results show that critical slope steepness of shallow gully erosion occuring is 18 °, and 40 metres in critical slope length , 650 square metre in runoff converged area .

鄂尔多斯盆地周边岩溶分布区由22个汇水面积不等的岩溶地下水子系统组成。

The karst groundwater system in Ordos basin consists of22 sub-systems with various catchment sizes .

面积管长比法划分汇水面积的探讨

Discussion on Division of Water Catchment Area by Using the Ratio of Total Area and Path Length Method

为了得到连续的河网，方法中引入了汇水面积阈值的概念，但对于同一流域，利用不同的汇水面积阈值将得到不同的河网。

A drainage area threshold is used to produce a continuous network , so that different network is obtained for varying drainage area threshold .

各水质指标的初期效应强度随不透水比例增加而增加，随汇水面积增加而减小。

The strength of first flush effect is increased with the increased proportion of impervious area and is decreased with the increased catchment area .

且临界坡长、浅沟分布间距和临界汇水面积与坡面平均坡度呈二次曲线关系。

The critical slope length , distance between shallow gullys and cri - tical runoff converged area are a square function of slope stepness .

提出了雨水系统设计计算中划分汇水面积的新方法&面积管长比法（亦称树分法），即将汇水面积按管长分配的方法。

A new method & ratio of total area and path length method was presented for dividing the water catchment area in the design of rainwater system .

雨水立管的汇水面积应结合是否安装雨水斗、是否设置天沟及斗前水深进行计算确定。

The water catchment area of rain leader shall be determined based on whether the rainwater hopper and gutter are set up , and the calculation of water depth before the rainwater hopper .

针对重力流屋面雨水系统设计及施工中经常遇到的钢结构屋面漏水和立管汇水面积的确定等问题进行了探讨。

Water leakage from steel structural roof and determination of water catchment area of rain leader always were met in the design and construction of roof rainwater system with gravity flow , and these problems are discussed .

结合图论原理，以排水管网为对象，采取广度优先算法，开发出管网自动识别系统，应用到主次管线的自动搜索、任意节点汇水面积的自动化计算。

According as graph theory , taking drainage pipe network as research object , using Breath First Search algorithm , we develop auto-recognition drainage pipe network system , and make it into application of auto-calculation of catchment area .

把具有时效性的降雨因子通过地表汇水面积的表达，转化成为了斜坡坡面汇集地表水的能力来考虑，从而也间接地将降雨作为空间静态评价指标与斜坡的稳定性联系了起来。

Based on the concept catchment area , the temporal rainfall variable can be translated into capacity of accumulating surface water of slopes , and thus associate rainfall as a spatial evaluation indicator with the stability of slopes indirectly .

以高层建筑室外雨水汇水面积划分图为例，详细分析了高层建筑室外雨水系统设计中汇水面积，延缓系数以及地面集水时间的确定方法。

The paper thoroughly analyses the method to determine the catchment area , delaying coefficient and convergent time for the outdoor downpipe design of the high-rise building through an example of the division diagram of its outdoor rainwater catchment area .

针对这一问题，论文引入了汇水面积的概念：即降雨发生后，斜坡地表由于地形差异，所表现出来的汇集由雨水转化而来的地表水能力的大小。

So the thesis introduced a concept namely " catchment area ": that is , after the occurrence of rainfall , due to the difference of slope landform , slopes have different capacity of accumulating surface water which comes from the rainfall .

本文分析了航片上的倾斜误差和投影差，并推导出在倾斜航片上量测汇水面积时倾斜误差和投影差的改正系数，给出了改正方法。

This paper not only correct coefficient correction of error of tilt and relief displacement but also offers method to define area of converging water by use of tilt-photograph on the basis of analysis of influence caused by error of tilt and relief displacement .

提出了一种方法，利用河源密度（或河网密度）与汇水面积阈值的关系，确定汇水面积阈值，当河源密度（或河网密度）趋于稳定时对应合理的面积阈值。

A method is proposed , in which the relation between source density ( or drainage density ) and the threshold is used to produce an ideal drainage network , the area threshold when source density ( or drainage density ) show stability is reasonable .

研究结果表明：（1）三个不同尺度的水塘湿地系统对氮、磷的截留效果不仅与自身的容积、净化能力有关，而且与其所处的地块特征及其汇水面积紧密相关；

The results show that : ( 1 ) the different dimensions pond wetland system 's retention effect of N and P relates to not only itself cubage and the ability of purification of itself , but also its characteristic of the place and its catchments area ;