China Institute of Water Resources and Hydropower Research

Developing optimal operating rules for a multi-reservoir system with multi-objective water utilization and multi-year carryover storage: A case study of the Upper Yellow River

Study region The multi-reservoir system on the Upper Yellow River, China, comprising Longyangxia, Laxiwa, Lijiaxia, Gongboxia, Jishixia, and Liujiaxia. Study focus To address the difficulty of directly translating optimal operation results under multi-reservoir, multi-objective,...

AquaCrop-derived surrogate model for crop yield response to monthly irrigation deficit

Context: The Upper Yellow River Basin faces acute water competition between cascade hydropower operations and large irrigation districts. Traditional multi-objective reservoir operation leads to distorted energy-food benefit trade-offs from oversimplified linear representation of...

Analysis of Soil Quality Characteristics and Driving Factors of Micro-Landforms in Loess Hilly Areas

To assess soil quality in micro-topographic units of loess hilly regions, this study selected five typical micro-landforms (shallow gully, collapse, steep slope, gentle terrace, cut gully) along with the original slope as a control. We measured 23 indicators covering soil physico...

Downscaling of SMAP Soil Moisture Based on the Transformer Algorithm in Anhui Province

Soil moisture (SM) is critical for climate, water, and agriculture, but Soil Moisture Active Passive (SMAP) passive microwave products have coarse resolution, limiting regional applications. This study develops an SM downscaling framework based on Transformer and its variants (Pa...

Spatiotemporal evolution and driving factors of ecosystem health in the Poyang lake region under compound pressures

Abstract Revealing the mechanisms underlying ecosystem health evolution in large river-connected lakes under intensive human activities is essential for adaptive management. However, existing studies primarily focus on ecological state changes or individual driving factors, with...

Enhanced tidal level forecasting: A hybrid CEEMDAN-LSTM framework with Bayesian optimization

Accurate tidal forecasts are crucial for preventing flood disasters and saltwater intrusion caused by high tides. To this end, this study proposes a hybrid CEEMDAN–LSTM–BO framework to improve tidal forecast accuracy. First, the Complete Ensemble Empirical Mode Decomposition with...

An improved SCF‑SWE relationship function with topographic controls for enhanced snowmelt runoff simulation

Study region The Yarlung Zangbo River Basin (YZRB), a representative high‑altitude alpine‑glacial basin in Xizang, southwestern China. Study focus To improve the snowmelt runoff simulation accuracy of the EasyDHM (Easy Distributed Hydrological Model) in the YZRB, this study propo...

Identification of flood routing characteristics and vulnerability in complex river networks

To investigate flood routing mechanisms in the Northern Branch of the Daqing River Basin, this study constructed a coupled 1D-2D hydrodynamic model incorporating geospatial datasets and historical flood records. The model performance was validated against remote sensing-derived i...

Compound patterns and environmental drivers of typhoon disaster chains in southeast coastal China: a multiscale framework

Typhoons frequently trigger interacting hazards, including river flooding, urban waterlogging, landslides, and storm surge, but disaster records compiled at the event or administrative-unit level limit systematic analysis of their spatial co-occurrence and environmental different...

Influence of time step on flood design using the instantaneous unit hydrograph method in Shandong Province

The instantaneous unit hydrograph (IUH) method is one of the primary recommended methods for flood design in small and medium-sized catchments in Shandong Province, China. The selection of the calculation time step (Δt) directly affects the shape of the flood hydrograph and the p...

Spatiotemporal Dynamics and Multi-Scale Diagnosis of Urban Resilience to Typhoon Disaster Chains in Fujian, China

Abstract Coastal cities in southeastern China face increasing threats from typhoon-induced compound disasters (for example, torrential rainfall, urban waterlogging, and storm surges) that can cascade into interconnected disaster chains under climate change and rapid urbanization....

Impact of extreme rainstorm on the spatial distribution of population exposure in Haihe River basin in China

Abstract Based on daily rainfall data from 252 national meteorological stations in the Haihe River Basin of China during 1961–2023, rainstorm events were divided, and four characteristic variables representing the hazard index of rainstorms were statistically analyzed, including...

Effect of Blade Number on the Performance of a Small Francis Turbine for Rural Local Power Generation

The increasing integration of distributed photovoltaics and wind power in rural grids necessitates enhanced peak-regulation flexibility, for which small Francis turbines offer a promising solution. This study investigates the effect of long–short blade number on the hydraulic per...

Pollution assessment and source analysis of heavy metals and nutrients in sediments of Liujiaxia reservoir, upper Yellow River, China

Abstract To investigate the pollution characteristics, ecological risks, and sources of nutrients and heavy metals in the sediments of the Liujiaxia Reservoir, 21 surface sediment samples were collected in August 2025. Concentrations of total nitrogen (TN), total phosphorus (TP),...

Response of yield, water and fertilizer use efficiency of sweet potato to different drip fertigation regimes under mulching conditions in a humid region of East China

Developing precise irrigation and fertilization regimes is essential for sustaining sweet potato productivity, particularly in humid regions where rainfall variability complicates soil nutrient and water resource management. A two-year field experiment was conducted to investigat...

A Two-Stage Machine Learning Framework for High-Resolution Multi-Source Precipitation Fusion in Complex Terrain: A Case Study of Shaoxing, China

High-resolution precipitation fields are essential for flash-flood forecasting and hydrological risk management, especially in small and medium-sized basins, yet single-source precipitation products often show limited accuracy over complex terrain. This study develops a two-stage...

Response of Mechanical Properties in PVC-P GMB to Tensile Rate and Low Temperature

Plasticized polyvinyl chloride (PVC-P) geomembranes (GMBs) are widely used in cold regions as impervious barriers, facing combined low-temperature and variable loading effects. However, design specifications rely on room-temperature tests at fixed rates, not reflecting actual con...

Spatiotemporal Evolution and Driving Mechanisms of Soil Drought in the Haihe River Basin (2000–2022) Based on the Standardized Soil Moisture Index

Accurately depicting the spatiotemporal evolution patterns and driving mechanisms of soil drought is of great significance for regional agricultural drought warning and adaptive management of water resources. There are still shortcomings in the existing research in terms of indic...

Enhancing the WAS physical hydrological model and integrating machine learning and residual decomposition to improve runoff simulation performance in the cold region of the Taoerhe River Basin, Northeast China

Study region: The Taoerhe River Basin, located in Northeast China. Study focus: Physical hydrological models still have limitations in representing runoff processes in seasonally frozen semi-arid basins. This study improved runoff simulation through physical model modification an...