随着天津滨海河口入海径流量逐年降低，以及城市水资源供需矛盾日益加剧，入海径流量远不能满足目前滨海河口生态需水量，因此，非常有必要开发非常规水源对滨海河口进行生态补水。在天津非常规水源（包括海水、雨水和再生水）现状分析的基础上，通过水资源利用途径分析和水量估算，得出雨水和再生水资源的可利用量完全可以满足滨海河口适宜生态需水量，并提出了滨海河口生态补水的措施。

With the yearly decreasing discharge into sea and the increasing contradiction between the water resources supply and demand in urban area, the amount of discharges can not meet the ecological water demand of Tianjin coastal estuaries. As a result, it is very necessary to develop unconventional water compensation to ecological water for coastal estuaries. In this paper, unconventional water resources in Tianjin were surveyed, which included seawater, rainwater and reuse water. Combined with the utilization ways of unconventional water resources in Tianjin, the water amount which could be used for supplying ecological water to coastal estuaries was estimated. The results showed that the amount of rainwater and reuse water could absolutely meet the ecological water demand of coastal estuaries. And measures for ecological water supplement in coastal estuary were put forward. This research will provide technical reference for the effective development and utilization of unconventional water in Tianjin as well as effective supplement of ecological water for coastal estuaries.

天津市水务局科技计划项目（KY2014-03）；水利部公益性行业科研专项（201101059）