Against the background of rapid climate warming,frequent and severe flooding disasters significantly impact socio-economic development and human life.In 2023,due to the northward movement of Typhoon Doksuri,extreme pr...Against the background of rapid climate warming,frequent and severe flooding disasters significantly impact socio-economic development and human life.In 2023,due to the northward movement of Typhoon Doksuri,extreme precipitation occurred in northern China,which resulted in a massive flood event in the Haihe River basin.Seven flood detention basins(FDBs)in North China were successfully implemented to effectively alleviate the downstream flood pressure.Leveraging all available Chinese satellite data,we monitored the flooding process daily,focusing on reviewing the flooding in the Dongdian FDB.The results indicate that since the activation of Dongdian FDB on August 1,the flood reached the urban area of Tianjin in just nine days and inundated the entire detention basin.Flooding persisted in the detention basin for about a week before gradually receding.The total maximum inundated area in the whole region was 307.5 km^(2),including 240.5 km^(2)of arable land,7.0 km^(2)of greenhouse land,and 9.7 km^(2)of built-up land,with an average inundation duration of 19 days.The total cumulative inundated arable land area was 240.5 km^(2),with an average inundation time of 21 days.This study shows that multi-source Chinese satellite data can provide comprehensive information and adequate references for post-disaster assessments.展开更多
Shoaling intensity in zebrafish Danio rerio is believed to vary throughout subjective day and night hours. This experiment examines long term variations in shoaling behavior. Adult zebrafish Dan io rerio were maintain...Shoaling intensity in zebrafish Danio rerio is believed to vary throughout subjective day and night hours. This experiment examines long term variations in shoaling behavior. Adult zebrafish Dan io rerio were maintained under a 12：12 LD cycle （with dim red light serving as reduced visibility during subjective dark hours）, and their shoaling behavior was monitored every hour for a three-day period of time. Our results show that zebrafish perform shoaling behavior throughout subjective day and under reduced visibility conditions, although mean shoaling times during the light phase were significantly higher than mean shoaling times during the dark phase. However, on the 3^rd day of the experiment, mean shoaling times during the subjective night had increased and mean shoaling times during the subjective day had decreased. This shift in intensity was not seen on the first two days of the study, and may represent the influence of experience on the behavior of the test fish. We believe this study shows that shoaling behavior changes with light/dark cycles and that fish shoal even during reduced visibility conditions.展开更多
基金The Research and Development Program of China(2021YFB3901205)。
文摘Against the background of rapid climate warming,frequent and severe flooding disasters significantly impact socio-economic development and human life.In 2023,due to the northward movement of Typhoon Doksuri,extreme precipitation occurred in northern China,which resulted in a massive flood event in the Haihe River basin.Seven flood detention basins(FDBs)in North China were successfully implemented to effectively alleviate the downstream flood pressure.Leveraging all available Chinese satellite data,we monitored the flooding process daily,focusing on reviewing the flooding in the Dongdian FDB.The results indicate that since the activation of Dongdian FDB on August 1,the flood reached the urban area of Tianjin in just nine days and inundated the entire detention basin.Flooding persisted in the detention basin for about a week before gradually receding.The total maximum inundated area in the whole region was 307.5 km^(2),including 240.5 km^(2)of arable land,7.0 km^(2)of greenhouse land,and 9.7 km^(2)of built-up land,with an average inundation duration of 19 days.The total cumulative inundated arable land area was 240.5 km^(2),with an average inundation time of 21 days.This study shows that multi-source Chinese satellite data can provide comprehensive information and adequate references for post-disaster assessments.
文摘Shoaling intensity in zebrafish Danio rerio is believed to vary throughout subjective day and night hours. This experiment examines long term variations in shoaling behavior. Adult zebrafish Dan io rerio were maintained under a 12：12 LD cycle （with dim red light serving as reduced visibility during subjective dark hours）, and their shoaling behavior was monitored every hour for a three-day period of time. Our results show that zebrafish perform shoaling behavior throughout subjective day and under reduced visibility conditions, although mean shoaling times during the light phase were significantly higher than mean shoaling times during the dark phase. However, on the 3^rd day of the experiment, mean shoaling times during the subjective night had increased and mean shoaling times during the subjective day had decreased. This shift in intensity was not seen on the first two days of the study, and may represent the influence of experience on the behavior of the test fish. We believe this study shows that shoaling behavior changes with light/dark cycles and that fish shoal even during reduced visibility conditions.
