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首页> 外文期刊>Journal of the American Water Resources Association >URBAN STREAMFLOW RESPONSE TO IMPORTED WATER AND WATER CONSERVATION POLICIES IN LOS ANGELES, CALIFORNIA
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URBAN STREAMFLOW RESPONSE TO IMPORTED WATER AND WATER CONSERVATION POLICIES IN LOS ANGELES, CALIFORNIA

机译：加利福尼亚州洛杉矶市对进口水和水节约政策的径流响应

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摘要

Los Angeles has a long history of importing water; however, drought, climate change, and environmental mitigation have forced the City to focus on developing more local water sources (target of 50% local supply by 2035). This study aims to improve understanding of water cycling in Los Angeles, including the impacts of imported water and water conservation policies. We evaluate the influence of local water restrictions on discharge records for 12 years in the Ballona Creek (urban) and Topanga Creek (natural) watersheds. Results show imported water has significantly altered the timing and volume of streamflow in the urban Ballona watershed, resulting in runoff ratios above one (more streamflow than precipitation). Further analysis comparing pre- vs. during-mandatory water conservation periods shows there is a significant decrease in dry season streamflow during-conservation in Ballona, indicating that prior to conservation efforts, heavy irrigation and other outdoor water use practices were contributing to streamflow. The difference between summer streamflow pre- vs. during-conservation is enough to serve 160,000 customers in Los Angeles. If Los Angeles returns to more watering days, educating the public on proper irrigation rates is critical for ensuring efficient irrigation and conserving water; however, if water restrictions remain in place, the City must take the new flow volumes into account for complying with water quality standards in the region.
机译：洛杉矶有悠久的进口水历史。但是，干旱，气候变化和环境缓解已迫使纽约市集中精力开发更多的本地水源（到2035年将本地水供应量占50％的目标）。这项研究旨在增进对洛杉矶水循环的理解，包括进口水的影响和节水政策。我们评估了Ballona Creek（城市）和Topanga Creek（自然）流域12年的局部水限制对排放记录的影响。结果表明，进口水已大大改变了城市Ballona流域的水流时间和流量，导致径流比大于1（水流比降水多）。进一步的分析比较了强制性节水前期和强制性节水期之间的关系，结果表明，在Ballona进行的节水期间，旱季水流量显着减少，这表明在节水努力之前，大量灌溉和其他室外用水习惯对水流产生了影响。保护期夏季流量与保护期夏季流量之间的差异足以为洛杉矶的16万客户提供服务。如果洛杉矶恢复了更多的浇​​水天数，则对公众进行适当灌溉率的教育对于确保有效灌溉和节约用水至关重要。但是，如果水限制仍然存在，纽约市必须考虑新的流量以符合该地区的水质标准。

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