In pursuance of investigating the variation characteristics of rainfall amount in Poyang Lake area, the daily rainfall dataset (including rainy days and rainfall amount) of Duchang hydrometric station, located at middle Poyang Lake, with a 60-year common record length of the daily rainfall from 1953 to 2012, is classified into different levels according to rainfall classification standard. The variation characteristics and distribution features of rainy days and rainfall amount are examined with methods of trend and catastrophe test, Hurst index, precipitation concentration degree (PCD) and precipitation concentration period (PCP). Results reveal that: (1) The number of average annual rainy days is 134, of which light rainy days, moderate rainy days, heavy rainy days and torrential rainy days account for 70.9%, 18.66%, 8.2% and 2.98%, respectively; during the past decades, the total annual rainy days, light rainy days and torrential rainy days exhibit a significant decreasing trend and is likely to continue. Total annual rainy days changed abruptly (reduced by 14 days) in 1978. In spring and summer, heavy and torrential rainy days occupy a high portion, whereas in autumn and winter, light and moderate rainy days are dominant. (2) The average annual rainfall amount is 1 335.66 mm, of which light rain, moderate rain, heavy rain and torrential rain account for 20.74%, 29.50%, 27.35% and 22.41%, respectively; the annual rainfall amount exhibits a significant and lasting decreasing trend and changed abruptly (declined by 301.26 mm) in 1976. (3) The precipitation concentration degree (PCD), which varies greatly due to distinguishable distribution feature of rainy days and precipitation in different years, has an average of 0.4; the precipitation concentration period (PCP) is mainly from mid-March to mid-June, of which from mid-April to mid-May accounts for 71.43%. The decrease of rainy days is mainly caused by declining light rainy days, but annual rainfall amount is affected by rainfall of all levels. PCD, closely related to the ratio of heavy rain and torrential rain to annual precipitation, is significantly positively correlated with the uniformity coefficient of precipitation.
Key words
graded rainy days /
graded rainfall amount /
precipitation concentration degree /
variation characteristics /
Poyang Lake area
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 长江流域及西南诸河水资源公报(2015)[R]. 武汉:长江出版社, 2016.
[2] 江西省水利厅. 江西省水资源公报(2015)[R]. 南昌:江西省水利厅,2016.
[3] XUE D, WAN R, YANG G. Non-stationary Water-level Fluctuation in China's Poyang Lake and Its Interactions with Yangtze River[J]. Journal of Geographical Sciences, 2015, 25(3):274-288.
[4] 胡振鹏, 葛 刚, 刘成林. 鄱阳湖湿地植被退化原因分析及其预警[J]. 长江流域资源与环境, 2015, 24(3):381-386.
[5] XU X L, ZHANG Q, TAN Z Q, et al. Effects of Water-table Depth and Soil Moisture on Plant Biomass, Diversity, and Distribution at a Seasonally Flooded Wetland of Poyang Lake, China[J]. Chinese Geographical Science, 2015, 25(6):739-756.
[6] 李云良, 张小琳, 赵贵章,等. 鄱阳湖区地下水位动态及其与湖水侧向水力联系分析[J]. 长江流域资源与环境, 2016, 25(12):1894-1902.
[7] 林 欢, 许秀丽, 张 奇. 鄱阳湖典型洲滩湿地水分补排关系[J]. 湖泊科学, 2017, 29(1):160-175.
[8] 范少英. 江湖关系变化对鄱阳湖水文水动力的影响研究[D].武汉:武汉大学,2018.
[9] 邴建平,邓鹏鑫,吕孙云,等.鄱阳湖与长江干流水量交换效应及驱动因素分析[J]. 中国科学:技术科学,2017,47(8):856-870.
[10]戴 雪,万荣荣,杨桂山,等. 鄱阳湖水文节律变化及其与江湖水量交换的关系[J].地理科学,2014,34(12):1488-1496.
[11]水利部长江水利委员会. 长江流域(片)第三次水资源调查评价工作大纲[R]. 武汉:水利部长江水利委员会,2017.
[12]彭 锐, 黄河清, 郑 林. 鄱阳湖区1959年至2005年降雨过程的持续性特征与减灾对策[J]. 资源科学, 2009, 31(5):731-742.
[13]李红梅, 王宇亮, 雷向杰,等. 近44年关中夏季分级雨日及降雨量的变化特征[J]. 中国农业资源与区划, 2017, 38(8):64-72.
[14]王 娜, 王 琦, 方 锋,等. 陕西省极端无雨日数的时空分布特征[J]. 干旱地区农业研究, 2014, 32(6):221-228.
[15]张应华, 宋献方. 水文气象序列趋势分析与变异诊断的方法及其对比[J]. 干旱区地理, 2015, 38(4):652-665.
[16]王毓森. 水文时间序列趋势与突变分析系统开发与应用[J]. 甘肃科技, 2016, 32(9):36-37.
[17]魏凤英. 现代气候统计诊断与预测技术[M].2版. 北京:气象出版社,2007.
[18]冯新灵, 冯自立, 罗隆诚,等. 青藏高原冷暖气候变化趋势的R/S分析及Hurst指数试验研究[J]. 干旱区地理, 2008, 31(2):23-29.
[19]丁之勇, 鲁瑞洁, 刘 畅,等. 环青海湖地区气候变化特征及其季风环流因素[J]. 地球科学进展, 2018, 33(3): 281-293.
[20]李英杰, 延军平, 刘永林. 秦岭南北气候干湿变化与降雨非均匀性的关系[J]. 干旱区研究, 2016, 33(3):619-627.
[21]徐利岗, 周宏飞, 杜 历,等. 1951—2008年中国西北干旱区降雨时空变化及其趋势[J]. 中国沙漠, 2015, 35(3):724-734.
[22]谢 平,陈广才,雷红富.基于Hurst 系数的水文变异分析方法[J].应用基础与工程科学学报,2009,17(1):32-39.
[23]刘贤赵, 李嘉竹, 宿 庆,等. 基于集中度与集中期的径流年内分配研究[J]. 地理科学, 2007, 27(6):791-795.
[24]纳 丽, 李 欣, 朱晓炜,等. 宁夏近50 a降雨集中度和集中期特征分析[J]. 干旱区地理, 2012, 35(5):724-731.
[25]汪卫平, 杨修群, 张祖强,等. 中国雨日数的气候特征及趋势变化[J]. 气象科学, 2017, 37(3):317-328.
[26]陈昌春. 变化环境下江西省干旱特征与径流变化研究[D]. 南京:南京大学, 2013.
[27]霍 雨, 王腊春, 陈晓玲,等. 1950s以来鄱阳湖流域降雨变化趋势及其持续性特征[J]. 湖泊科学, 2011, 23(3):454-462.
[28]王怀清, 赵冠男, 彭 静,等. 近50年鄱阳湖五大流域降雨变化特征研究[J]. 长江流域资源与环境, 2009, 18(7):615-619.
[29]涂安国, 杨 洁, 李 英,等. 鄱阳湖流域气候变化及其对入湖径流量的影响[J]. 水资源与水工程学报, 2015, 26(5):35-39.
PDF(4840 KB)
