CAJ | 학술논문

对黄河上游靖远景泰段峡谷进行系统野外考察，在靖远县金坪村（JPC）发现典型的全新世古洪水滞流沉积物。通过光释光（OSL）测年和与黄河吉县段FJJ剖面进行地层对比，确定这期特大古洪水事件发生在3200～3000aB．P．，即全新世中期晚期气候恶化转折阶段，对应着我国历史上商末至西周早期。采用古洪水水文学方法恢复古洪水洪峰水位，并且采用比降面积法计算这一期多次古洪水事件的洪峰流量为16110～17740m3／s。同时，根据野外调查获得2012年7月31日黄河上游大洪水的洪痕高程，采用相同参数和方法恢复其洪峰流量，误差仅有2．7％，表明在该河段对于古洪水水文恢复计算参数选取和计算结果是可靠的。
대황하상유정원경태단협곡진행계통야외고찰，재정원현금평촌（JPC）발현전형적전신세고홍수체류침적물。통과광석광（OSL）측년화여황하길현단FJJ부면진행지층대비，학정저기특대고홍수사건발생재3200～3000aB．P．，즉전신세중기만기기후악화전절계단，대응착아국역사상상말지서주조기。채용고홍수수문학방법회복고홍수홍봉수위，병차채용비강면적법계산저일기다차고홍수사건적홍봉류량위16110～17740m3／s。동시，근거야외조사획득2012년7월31일황하상유대홍수적홍흔고정，채용상동삼수화방법회복기홍봉류량，오차부유2．7％，표명재해하단대우고홍수수문회복계산삼수선취화계산결과시가고적。
A systematical field investigation is carried out in the upper Yellow River valley from Jingtai to Jingyuan reach .Palaeoflood slackwater deposits (SWD) are identified at several sites .The Holocene sediment profile at the site of Jinpingcun (JPC) is chosen for a further study on the palaeoflood hydrology .OSL dating and stratigraphic correlation with Jixian (FJJ) site in the middle reach gorge of the Yellow River show that these extreme palaeoflood events occurred during 3 200 3 000 a B .P .,at the time when the climate was at the turn from the Middle Holocene climatic optimum to the Late Holocene dry period .This corresponds to the transition period from Shang Dynasty to Western Zhou Dynasty when many serious drought and flood disasters , harvest failures , and major social changes occurred . The palaeoflood stage is obtained by palaeohydrological methods . The reconstructed palaeoflood peak discharges were 16 110 17 740 m 3 /s using the slope‐area method .Reconstruction of current flood (in 2012 .07 .31) and comparison with the gauged discharge prove that the hydrological method and hydrological parameters used are reliable .These results are very important to establish the relationship between peak discharge and occurrence frequency by 10 000‐year time‐scale in Lanzhou to Jingyuan reach .The method is very useful in Hydraulic engineering along the upper Yellow River .