陇东地区沟道雨洪资源可利用量研究

发布时间：2018-04-12 18:31

本文选题：单次暴雨分析法 + 典型年法　；参考：《人民黄河》2016年06期

【摘要】：根据甘肃陇东地区特殊的地形地貌及雨洪资源特点,以西峰区司家沟为例,分析计算该流域的雨洪资源可收集利用量。利用庆阳市西峰区的DEM数据、Quickbird资料和GIS软件对沟道特征进行分析,获得雨洪资源计算所需的沟道属性,选取暴雨频率为1%、5%、10%、20%、33%、50%和99%,进行沟道洪水特征分析。采取典型年法和单次暴雨分析法将暴雨频率与降雨频率统一,将不同降雨频率典型年大于20 mm的单次降水与基准暴雨量相对应,计算出典型年沟道的雨洪总量(可收集利用量)和单次降水的洪峰流量,得到降水保证率为25%时(1973年)雨洪资源可利用量为83.98万m~3,降水保证率为50%时(1980年)雨洪资源可利用量为81.28万m~3,降水保证率为75%时(2009年)雨洪资源可利用量为34.72万m~3,降水保证率为95%时(1986年)雨洪资源可利用量为42.49万m~3。计算结果表明,司家沟不同降水保证率沟道雨洪资源量的基本趋势为高保证率雨洪资源量小,低保证率雨洪资源量大,与降雨频率总体趋势一致;洪水频率跟降雨频率不同步,在干旱年降雨频率低时,洪水频率有可能较大,因此干旱年份对雨洪资源的利用显得尤为重要。
[Abstract]:According to the special topographic and geomorphological features and the characteristics of rain and flood resources in the east of Gansu Province, taking Sijiagou in Xifeng area as an example, the collection and utilization of rain and flood resources in this basin are analyzed and calculated.Based on the DEM data of Xifeng District of Qingyang City and the GIS software, the channel characteristics are analyzed, and the channel attributes needed for the calculation of rain and flood resources are obtained. The characteristics of channel flood are analyzed by selecting the rainstorm frequency of 1 / 10 / 10 / 10 / 20 / 33 / 50% and 99g / 99 respectively.The typical year method and the single rainstorm analysis method are adopted to unify the rainstorm frequency with the rainfall frequency, and the single rainfall with different rainfall frequency over 20 mm per year is corresponding to the base storm rainfall.The total amount of rain and flood (which can be collected and utilized) and Hong Feng flow of a single precipitation in a typical year are calculated.The results show that the availability of rain and flood resources is 839800 mm3 in 1973, 812800 mm3 in 1980, and 347200 mm3 in 75mh (2009).The rainfall guarantee rate is 95% (1986) and the available amount of rain and flood resources is 424900 m ~ (3) m 路m ~ (-1) 路m ~ (-1) 路m ~ (-1).The calculation results show that the basic trend of the different rainfall guarantee rate of Sijiagou is that the high guarantee rate of rain flood resources is small, the low guarantee rate of rain flood resources is large, and the general trend of rainfall frequency is consistent, and the flood frequency is out of step with the rainfall frequency.When rainfall frequency is low in dry year, flood frequency is likely to be larger, so the utilization of rain and flood resources in dry year is particularly important.
【作者单位】：甘肃省水土保持科学研究所;
【基金】：陇原青年创新人才扶持计划项目甘肃省科技厅重大专项(1203FKDA035) 甘肃省水利科研技术推广项目甘肃省科技支撑计划项目(1204NKCA087) 甘肃省水利厅水资源费项目
【分类号】：TV213.9

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