Inland flood risk in the United States is most often conveyed through maps of 1% annual exceedance probability (AEP) or “100‐year” floodplains. However, monetary damages from flooding arise from a full distribution of events, including floods both larger and smaller than the 1% AEP event. Furthermore, floodplains are not static, since both the frequency and magnitude of flooding are likely to change in a warming climate. We explored the implications of a changing frequency and magnitude of flooding across a wide spectrum of flood events, using a sample of 376 watersheds in the United States where floodplains from multiple recurrence intervals have been mapped. Using an inventory of assets within these mapped floodplains, we first calculated expected annual damages (EADs) from flooding in each watershed under baseline climate conditions. We find that the EAD is typically a factor of 5–7 higher than the expected damages from 100‐year events alone and that much of these damages are attributable to floods smaller than the 1% AEP event. The EAD from flooding typically increases by 25–50% under a 1 °C warming scenario and in most regions more than double under a 3 °C warming scenario. Further increases in EAD are not as pronounced beyond 3 °C warming, suggesting that most of the projected increases in flood damages will have already occurred, for most regions of the country, by that time. Adaptations that protect against today's 100‐year flood will have increasing benefits in a warmer climate by also protecting against more frequent, smaller events.

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Through the analysis of historical data show that climate change and precipitation is the basic reason of Northern Gulf water properties. Analysis of temperature and salinity in the East and west of the Straits of the Joan Strait shows that the northern Bay maintains the characteristics of temperature salt in the eastern part of the Strait. Northern Gulf circulation in summer and

The western region of China is vast in territory and rich in water resources. It is the birthplace and upstream region of great rivers such as the Yangtze River, the Yellow River and Brahmaputra River. During the flood season, flood disasters and secondary disasters such as landslides, mudslides and dammed lake caused huge losses to the local residents. It need further attention and strengthen the analysis of flood season hydrological and disaster in the western region. This paper first introduces the basic situation of China's western area survey and flood season; secondly, to speak with the data, analysis of the 2017 flood season hydrological characteristics of the western region; thirdly, with the "Yangtze River 1 flood", "Jiuzhaigou earthquake" as examples, analyzes the characteristics of flood disaster in 2017 the western region; at the end of the paper, give out the summary and puts forward some opinions and suggestions to the Western sections hydrological disaster prevention and response, reduce the risk in flood season.

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