Rivers are changing all the time

Across the world, flooding is expected to become more frequent and extreme as the planet heats up.

Building robust flood defenses and modeling vulnerable areas is crucial if we are to avoid loss of life and livelihoods from these devastating weather events.

But our new research reveals that the capacity of rivers to keep water flowing within their banks can change quickly — and some flood models and defenses may be under-equipped to deal with the consequences.

Many assume that flooding is due to heavy rainfall. This is true, but only part of the explanation.

Floods also occur when the amount of water running off the land exceeds the capacity of rivers to carry that flow. This means that if the capacities of river channels change, then two identical rainfall events falling on similarly wet ground can cause flooding of very different severity.

Most rivers are forever changing. They are shaped by the sediments and water they carry. Humans have modified most of the world’s rivers in some way. In some cases, this is through direct influence, such as dam construction or river engineering.

Other influences are indirect — building on nearby land reduces the capacity of the ground to absorb water, agriculture draws water from rivers, and deforestation leaves more water to flow elsewhere.

Rivers respond to changes in climate as well. During drier periods, less water flows through river systems. This means that there is often less energy to move the sediments at their beds, so riverbed levels may progressively rise, decreasing the capacity of the river.

But it is not always easy to predict how rivers will change. Extreme shifts in channel shape and capacity can occur very rapidly. After a recent flash flood in Spain, one river rose almost a metre as huge volumes of sediment from upstream were displaced and dumped further along.

Uncertain risk

Unfortunately, such changes are typically ignored by flood engineers and modelers, who generally treat the channel as a fixed feature. If rivers actually change their capacity in space and time, then estimates of flood probability may be incorrect, putting people and property at risk.

Motivated by these concerns, we investigated the pace at which channel changes occur, and to what extent these alterations might be driven by climate. We began with a simple conceptual model: Climate controls rainfall, rainfall affects river flow, and river flow shapes channel capacity.

Direct observations of this link were lacking in river systems over short timescales. So, we took 10,000 measurements of the capacity of 67 rivers in the US, covering a period of nearly 70 years.

We also gathered rainfall and river flow data, to assess how climatic changes affected the capacity of the rivers. We discovered that temporary shifts in river capacity, lasting years to decades, were far more frequent than had previously been assumed.

Overall, river capacity tends to increase during periods that are wetter than average due to greater erosion of river channels, and decrease in drier periods. We also found that multi-year climate cycles that affect regional precipitation patterns can cause channel capacity to expand and contract too, perhaps on a global scale.

Armed with this knowledge, we may eventually be able to predict how the capacity of rivers changes, and hence better understand flood risk.

In temperate regions such as the UK, where rivers tend to be vegetated, heavily engineered and relatively stable, delicate changes in channel capacity are hard to detect and unlikely to be life-threatening.

However, in river systems that carry high volumes of sediment, or in parts of the world where rainfall varies considerably during the year, sudden reductions in river capacity may dramatically increase flood risk for nearby settlements.

For example, the Ganges-Brahmaputra river in India and Bangladesh falls under this category. Its capacity is already changing, and its floodplains are some of the most densely populated in the world.

Unfortunately, we still have a very poor understanding of the nature and causes of channel capacity changes in most regions — and it is the most at-risk places that tend to have the least data.

Louise Slater is Associate Professor in Physical Geography, University of Oxford. Abdou Khouakhi is Research Associate, Climate and Weather Data Analysis, Loughborough University. Robert Wilby is Professor of Hydroclimatic Modelling, Loughborough University. A version of this article previously appeared on The Conversation UK.